TWI811573B - Storage device and accessing method for operation log thereof - Google Patents

Abstract

A storage device is capable of executing an accessing method of an operation log. The method includes configuring a buffering area of a memory and caching an operation log of a storage device in the buffering area; writing the operation log into a specific storage area of a flash and modifying an offset of a storage block of the memory; releasing the buffering area for re-caching an operation log; periodically updating the flash according to the storage block; starting a watch-dog circuit when the storage device starts initialization; reading the specific storage area of the flash to obtain the latest operation log when the watch-dog circuit counts to a predetermined number and the storage device has not finish the initialization; and closing the watch-dog circuit when the storage device finishes the initialization.

Description

Storage device and its operation log access method

The present application relates to the field of log recording technology, and in particular, to a storage device and a method for accessing its operation log.

As the application fields of storage devices (such as solid-state drives (SSD)) become increasingly widespread, the requirements for the stability of storage devices are also getting higher and higher.

The previous technology will record the user's operation information, alarm information, etc. on the storage device during the operation of the storage device, and form an operation log file and save it in the storage device. However, this method has limitations. If the translation layer of the flash memory of the controller of the storage device is damaged, the storage device will not be recognized (the disk will not be recognized), the file system will be lost, and the run log file will not be read. . When the flash memory conversion layer of the controller of the storage device is damaged, of course the storage device at this time cannot successfully complete the initialization process. If the storage device does not recognize the disk, the problem can only be analyzed by disassembling the casing of the storage device. However, since the storage device is usually packaged, if it is necessary to disassemble the casing to analyze the problem, the operation will be more complicated.

Embodiments of the present application provide a method and storage device for accessing a running log, which solves the problem in the prior art that the running log cannot be read when the flash memory conversion layer is damaged.

In order to solve the above technical problems, this application is implemented as follows:

In the first aspect, a method for accessing a running log is provided, which is applied to a storage device. The storage device includes a target memory, a flash memory and a controller. The method for accessing a running log includes the following steps: (a) Setting the target memory and temporarily store the running log of the device in the buffer area of the target memory; (b) write the running log in the buffer area to a specific storage area of the flash memory, and modify the target memory after the writing is completed The offset value recorded in the storage block of the target memory is released, and the buffer area of the target memory is released to re-execute step (a), where the offset value corresponds to the position where the running log in the buffer area is written to the specific storage area; (c) Update the storage block to the flash memory at predetermined intervals; (d) When the storage device enters the initialization phase, start the watchdog circuit of the controller; (e) When the watchdog circuit counts one After the preset count time has passed and the storage device has not completed the initialization phase, the storage device is set to a forced low-level format mode to obtain the latest operating log by reading a specific storage area of the flash memory; (f) When storing When the device completes the initialization phase, the watchdog circuit is turned off.

In a second aspect, a storage device is provided, including a target memory, a flash memory and a controller. The target memory and the flash memory are respectively connected to the controller. The controller includes a non-volatile memory and a processor. Among them, the non-volatile memory is used to store the program code that implements the access method of the running log. The processor is coupled to the non-volatile memory and is used to load the program code of the access method of the running log to perform the following steps: (a) setting a buffer area of the target memory and temporarily storing the running log of the device in the target memory (b) Write the running log in the buffer area to a specific storage area of the flash memory, and after the writing is completed, modify the offset value recorded in the storage block of the target memory, and release the target The buffer area of the memory to re-execute step (a), where the offset value corresponds to the location where the running log in the buffer area is written to the specific storage area; (c) update the storage block to the cache area at predetermined intervals flash memory memory; (d) when the storage device enters the initialization phase, start the watchdog circuit of the controller; (e) when the watchdog circuit counts a preset count time and the storage device does not complete the initialization phase, the storage device It is set to a forced low-level formatting mode and obtains the latest operating log by reading a specific storage area of the flash memory; (f) When the storage device completes the initialization phase, the watchdog circuit is turned off.

In the embodiment of the present application, by recording the operation log in a fixed location of the flash memory (ie, a specific storage area) during the operation of the storage device, the recording of the operation log is not affected by the file system; at the same time, using The watchdog circuit runs during the initialization phase of the storage device and cooperates with the self-detection and judgment mechanism of the storage device. If it is found that the storage device has not completed the initialization phase within a predetermined time, the watchdog circuit will be triggered to set the storage device to a forced low-level format. mode, directly read the specific storage area of the flash memory, and then obtain the latest running log, thus ensuring that the running log can be obtained without disassembling the casing of the storage device. Therefore, when an unpredictable phenomenon occurs in the storage device, the running log information can be obtained, and the cause can be analyzed through the obtained running log.

100:Storage device

110: Memory (target memory)

112: Buffer area

114:Storage block

116: Random access memory disk

120: Flash memory

122:Storage area

130:Controller

132:Host interface

134: Processor

136:Flash memory interface

138:Non-volatile memory

140:Watchdog circuit

S212: Step

S214: Step

S216: Step

S218: Step

S220: Steps

S222: Step

S412: Step

S414: Step

S416: Step

S418: Step

S420: Steps

S422: Step

The drawings described here are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings: FIG. 1 is a functional block diagram of a storage device according to an embodiment of the present invention.

FIG. 2 is a functional block diagram of a controller according to an embodiment of the present invention.

FIG. 3 is a method flow chart of an embodiment of a running log access method according to the present invention.

FIG. 4 is a method flow chart of another embodiment of the running log access method according to the present invention.

The embodiments of the present invention will be described below with reference to relevant drawings. In the drawings, the same reference numerals represent the same or similar elements or process flows.

It must be understood that the words "including" and "include" used in this specification are used to indicate the existence of specific technical features, numerical values, method steps, work processes, components and/or components, but do not exclude the possibility of Plus further technical features, values, method steps, processes, components, components, or any combination of the above.

The use of words such as "first", "second" and "third" in the present invention are used to modify the elements in the request, and are not used to indicate that there is a priority order or precedence relationship between them, or that one element comes first. to another component, or the time sequence when executing method steps, and is only used to distinguish components with the same name.

It must be understood that when an element is described as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, and intervening elements may be present. In contrast, when an element is described as being "directly connected" or "directly coupled" to another component, there are no intervening components present. In addition, unless otherwise specified in the specification, any term in the singular shall also include the plural.

Please refer to Figure 1, which is a functional block diagram of a storage device according to an embodiment of the present invention; as shown in the figure, the storage device 100 of this embodiment may include a memory 110 (also called a target memory), a flash memory 120 and the controller 130, the memory 110 and the flash memory 120 are electrically connected to the controller 130 respectively to transfer information and data. The storage device 100 may include a universal serial bus (USB) memory device, a memory card with various interfaces, a universal Flash memory (UFS) devices, solid state drives (SSD), etc.

The flash memory 120 of this embodiment includes multiple data blocks used to store read and write data. Each data block includes multiple physical pages (Pages), and each physical page has an individual physical address; where , the flash memory 120 is a non-volatile memory (Non-volatile memory, also called a non-volatile memory). The read and write speed is relatively slow during use, and the data stored in it can be continuously saved after a power outage. longer time. The flash memory 120 of this embodiment reserves a specific storage area 122 for storing the running logs from the storage device 100 temporarily stored in the memory 110 . In one embodiment, the specific storage area 122 includes a plurality of data blocks arranged in sequence.

The memory 110 of this embodiment reserves a buffer area 112 (that is, the buffer area 112 of the memory 110 is set) for temporarily storing the running log of the storage device 100, and includes a storage block 114 for storing area mapping. table and page mapping table. The area mapping table is used to map the logical address and physical address of each data block used to store read and write data in the flash memory 120, and each data block will correspond to The respective page mapping table is used to store the relationship between the logical address and the physical address of each page; among them, the memory 110 is a volatile memory (Volatile memory, also called a volatile memory), which is read during use. The writing speed is fast, and the data stored in it will disappear immediately after the power is turned off; the memory 110 is used to temporarily store the data required by the controller 130 to perform access operations; when the controller 130 enables the random access memory on the memory 110 After the RAM disk 116 is installed, a memory space is divided in the memory 110 for use by the random access memory disk 116 .

Please refer to FIG. 2 , which is a functional block diagram of a controller according to an embodiment of the present invention. The controller 130 may include a host interface 132, a processor 134, a flash memory interface 136, Non-volatile memory (Non-volatile memory) 138 and watchdog circuit (watchdog circuit, also called monitoring circuit) 140. The non-volatile memory 138 is used to store the program code that implements the access method of the running log. For example, a read-only memory (ROM, Read Only Memory), an erasable programmable read-only memory (EPROM, Erasable) can be used. Programmable Read Only Memory), Electronically Erasable Programmable Read-Only Memory (EEPROM, Electrically-Erasable Programmable Read-Only Memory), etc. The processor 134 can be implemented using general-purpose hardware (for example, a single processor, multiple processors with parallel processing capabilities, a graphics processor, or other processors with computing capabilities), and implements the storage of run logs during loading and execution. When retrieving the code of the method, complete the access method of the run log described below. The host interface 132 may use Serial advanced technology attachment (SATA), Peripheral component interconnect express (PCI-E), Universal serial bus (USB) interfaces and associated communications. The protocol receives read, write, erase and other commands from the external host (Host), as well as related parameters and data, and then executes them accordingly. The flash memory interface 136 is coupled to the flash memory 120 , and the processor 134 is coupled to the host interface 132 , the flash memory interface 136 , the non-volatile memory 138 and the watchdog circuit 140 . Processor 134 may communicate with the host through host interface 132 and with flash memory 120 through flash memory interface 136 . The flash memory interface 136 includes a plurality of registers, allowing the processor 134 to adjust the physical configurations of the flash memory interface 136 by changing the contents of the registers. The watchdog circuit 140 is used to be started by the processor 134 when the storage device 100 enters the initialization phase; during the initialization phase, the controller 130 performs a self-detection mechanism. When the watchdog circuit 140 counts a preset counting time and the storage device 100 Initialization phase not completed At this time, the watchdog circuit 140 triggers the processor 134 to set the storage device 100 to the Force Low Level Format Mode (Force LLF Mode) and enable the random access memory disk on the memory 110 116, to ensure the connection between the storage device 100 and the front-end host; when the controller 130 determines that the storage device 100 has completed the initialization phase (representing that the flash memory translation layer is in a correct and undamaged state), the processor 134 closes the watch gate Dog circuit 140.

In order to overcome the problem in the prior art that the running log cannot be read when the flash memory conversion layer is damaged, an embodiment of the present invention proposes a method for accessing the running log. The processor 134 performs First, temporarily store the running log in the buffer area 112 set in the memory 110, record the temporary running log in a fixed location of the flash memory 120 (ie, the specific storage area 122), and modify the storage area of the memory 110. The offset value recorded in block 114 (i.e., the area mapping table) is released, and the buffer area 112 of the memory 110 is released, so that the buffer area 112 of the memory 110 can re-execute the operation of temporarily storing the running log, so that the record of the running log is not affected by the Influence of the file system; the storage block 114 is updated to the flash memory 120 at predetermined intervals; in addition, when the storage device 100 enters the initialization phase, the watchdog circuit 140 of the controller 130 is activated and cooperates with the storage device 100 A self-detection and judgment mechanism, if the flash memory conversion layer is damaged (that is, the watchdog circuit 140 counts a preset counting time and the storage device 100 cannot successfully complete the initialization phase), the watchdog circuit 140 will trigger The processor 134 sets the storage device 100 to a forced low-level format mode by reading the specific storage area 122 of the flash memory 120 to obtain the latest running log, so that the casing of the storage device 100 can be obtained without disassembling the casing of the storage device 100. In this case, you can obtain the running log. Therefore, when an unpredictable phenomenon occurs in the storage device 100, the operation log can be obtained, and the cause can be analyzed through the obtained operation log. Detailed description is as follows: In one embodiment, when the processor 134 of the controller 130 loads the program code of the access method of the run log to implement the access method of the run log, please refer to Figure 3. Figure 3 shows the run log according to the present invention. A method flow chart of an embodiment of the access method is described in detail as follows.

Step S212: Set a buffer area 112 of the memory 110 and temporarily store the running log of the storage device 100 in the buffer area 112 of the memory 110.

Step S214: Write the running log in the buffer area 112 to the specific storage area 122 of the flash memory 120, and modify the data recorded in the storage block 114 of the memory 110 after the writing is completed. offset value, and release the buffer area 112 of the memory 110 to re-temporarily store the running log of the storage device 100 . The offset value corresponds to the position where the running log in the buffer area 112 is written to the specific storage area 122 . That is to say, the processor 134 writes (Program, also called programming) the running log temporarily stored in the buffer area 112 into the specific storage area 122 of the flash memory 120. Specifically, based on the storage area of the memory 110 The area mapping table and page mapping table stored in block 114 write the running log temporarily stored in the buffer area 112 to the specific storage area 122 of the flash memory 120 in the form of dynamic offset values, and then update the corresponding area mapping. The connection relationship between the logical address and the physical address of the table and page mapping table (that is, the offset value recorded in the storage block 114 of the memory 110 is modified after the writing is completed) to provide correspondence during subsequent reading and writing. use. In addition, after the writing is completed, the buffer area 112 of the memory 110 is released to re-temporarily store the running log of the storage device 100 . The specific storage area 122 is used cyclically. If the writing reaches the end, it will be used from the beginning again.

In an optional implementation, whenever the buffer area 112 is full, the processor 134 writes the running log in the buffer area 112 to the flash memory. The specific storage area 122 of the memory 120 is modified, and after the writing is completed, the offset value recorded in the storage block 114 of the memory 110 is modified, and the buffer of the memory 110 is released. Area 112 to re-stage the running log of the storage device 100 .

In an optional implementation, the specific storage area 122 of the flash memory 120 includes a plurality of data blocks, and the size of each data block is the same as the size of the buffer area 112 (for example: 4KB, 4,000 byte), so that whenever the buffer area 112 is full, the first data block of the specific storage area 122 of the flash memory 120 starts to be written into the running log in the buffer area 112; When the last data block of the specific storage area 122 of the flash memory 120 is continuously written into the running log in the buffer area 112, the specific storage area 122 of the flash memory 120 is then The first data block is continuously written into the running log in the buffer area 112 . In other words, the plurality of data blocks included in the specific storage area 122 are used cyclically.

Step S216: Update the storage block 114 to the flash memory 120 at predetermined intervals. Since the data in the storage block 114 disappears immediately after the power is turned off, in order to avoid the problem of confusing running logs after the power is turned on again, the processor 134 updates the storage block 114 at predetermined intervals. to the flash memory 120 .

Step S218: When the storage device 100 enters the initialization phase, start the watchdog circuit 140 of the controller 130.

Step S220: When the watchdog circuit 140 counts a preset counting time and the storage device 100 has not completed the initialization phase, the storage device 100 is set to a forced low-level formatting mode, by reading The specific storage area 122 of the flash memory 120 is obtained, and the latest running log is obtained.

In an optional implementation, when the watchdog circuit 140 counts the preset counting time and the storage device 100 has not completed the initialization phase, it is determined that the flash memory of the storage device 100 The conversion layer is damaged.

Step S222: When the storage device 100 completes the initialization phase, turn off the watchdog circuit 140.

In an optional implementation, when the storage device 100 completes the initialization phase, the watchdog circuit 140 is turned off, and the latest storage area in the flash memory 120 can also be updated. Block 114 is copied to the memory 110, and the running log is obtained and written to the flash memory 120 next time according to the offset value recorded in the copied storage block 114 in the memory 110. The location of the specific storage area 122.

In the above embodiment, since the running log is only temporarily stored through the buffer area 112, there is a possibility that when the processor 134 writes the running log temporarily stored in the buffer area 112 into the specific storage area 122 of the flash memory 120, the buffer area 112 That is, the running log generated when the processor 134 writes the running log to the flash memory 120 cannot be temporarily stored, causing a problem that some running logs cannot be stored. In order to solve the problem that some running logs cannot be stored and recorded in the above embodiment, in one embodiment, the buffer area 112 can be designed to include a first buffer sub-area and a second buffer sub-area, and access through a ping-pong mechanism. (Ping-pong Buffer) Write the temporarily stored running logs connected to the first buffer sub-area and the second buffer sub-area into the specific storage area 122 of the flash memory 120. For details, please refer to Figure 4. 4 is a method flow chart of another embodiment of the running log access method according to the present invention.

Step S412: Continue to temporarily store the running log in the first buffer sub-area and the second buffer sub-area.

Step S414: Use a ping-pong access mechanism to continuously write the running log filled in the first buffer sub-area and the second buffer sub-area into the specific storage area 122 of the flash memory 120, And after the running log filled in the first buffer sub-area or the second buffer sub-area is continuously written into the specific storage area 122 of the flash memory 120, the memory 110 is modified. The offset value recorded in the storage block 114 is obtained, and the first buffer sub-area or the second buffer sub-area of the memory 110 is released to re-execute step S412.

For example, the running log can be temporarily stored in the first buffer sub-area. When the first buffer sub-area is full, the running log can be temporarily stored in the second buffer sub-area. At the same time, the running log filled in the first buffer sub-area is written into the specific storage area 122 of the flash memory 120, and after the writing is completed, the first buffer area of the memory 110 is released. buffer sub-area, and modify the offset value recorded in the storage block 114 of the memory 110; when the second buffer sub-area is full, the running log is temporarily stored in the first buffer sub-area ( The first buffer sub-area will be released before the second buffer sub-area fills up the running log), and at the same time, the running log filled in the second buffer sub-area is written into the specific storage of the flash memory 120 area 122, and after the writing is completed, the second buffer sub-area of the memory 110 is released, and the offset value recorded in the storage block 114 of the memory 110 is modified.

Step S416: Update the storage block 114 to the flash memory 120 at predetermined intervals.

Step S418: When the storage device 100 enters the initialization phase, start the watchdog circuit 140 of the controller 130.

Step S420: When the watchdog circuit 140 counts a preset counting time and the storage device 100 has not completed the initialization phase, the storage device 100 is set to a forced low-level formatting mode, by reading The specific storage area 122 of the flash memory 120 is obtained, and the latest running log is obtained.

Step S422: When the storage device 100 completes the initialization phase, turn off the watchdog circuit 140.

The above-mentioned steps S416 to step S422 are the same as steps S216 to step S222, and therefore will not be described again.

In one embodiment, before the processor 134 performs the above-mentioned step S212 or step S412, the processor 134 is also configured to perform a low-level formatting (LLF) operation when the storage device 100 performs a low-level formatting (LLF) operation. The offset value recorded in the storage block 114 of the memory 110 is set to a default value, and the storage block 114 of the memory 110 is copied to the flash memory 120 . Therefore, the previously recorded running logs will not be affected, and the continuity of the running logs can be ensured. The preset value may be 0, but the present invention is not limited to this.

In one embodiment, the processor 134 is also configured to find the latest storage block 114 updated in the flash memory 120 before the power outage when the storage device 100 is powered on again. , and copied to the memory 110, and then according to the offset value recorded in the copied storage block 114 in the memory 110, the running log is obtained and written to the flash memory 120 next time. The location of the specific storage area 122.

To sum up, this application provides a method for accessing operation logs and a storage device. During the operation of the storage device, the operation logs are recorded in a fixed location of the flash memory. location (that is, a specific storage area) so that the records of the running log are not affected by the file system; at the same time, the watchdog circuit is used to run during the initialization phase of the storage device. If the flash memory conversion layer is damaged, the watchdog circuit will Trigger the processor to set the storage device into forced low-level formatting mode, directly read a specific storage area of the flash memory, and obtain the latest running log to ensure that the storage device can be stored without disassembling the casing of the storage device. Run logs can be obtained. Therefore, when an unpredictable phenomenon occurs in the storage device, the operation log can be obtained, and the cause can be analyzed through the obtained operation log.

All or part of the steps in the method of the present invention can be implemented by a computer program, such as a computer operating system, a driver for specific hardware in the computer, or a software program. In addition, other types of programs as shown above can also be implemented. A person with ordinary knowledge in the relevant technical field can write the method of the embodiment of the present invention into a computer program, which will not be described for the sake of simplicity. The computer program implemented according to the method of the embodiment of the present invention can be stored in an appropriate computer-readable medium, such as DVD, CD-ROM, USB, hard disk, or can be placed through a network (for example, the Internet, or other appropriate carriers). ) to access the web server.

Although the above-described components are included in the drawings of this application, it does not rule out the use of other additional components to achieve better technical effects without violating the spirit of the invention. In addition, although the flow chart of the present application is executed in a specified order, those skilled in the art can modify the order of these steps on the premise of achieving the same effect without violating the spirit of the invention. Therefore, the present application The invention is not limited to the use of only the sequence described above. In addition, those skilled in the art can also integrate several steps into one step, or in addition to these steps, perform more steps sequentially or in parallel, and the present invention is not limited thereby.

Although the present invention is described using the above embodiments, it should be noted that these descriptions are not intended to limit the present invention. On the contrary, the invention is intended to cover modifications and similar arrangements obvious to those skilled in the art. Therefore, the scope of the patent application must be interpreted in the broadest manner to include all obvious modifications and similar arrangements.

S212: Step

S214: Step

S216: Step

S218: Step

S220: Steps

S222: Step

Claims (9)

A method of accessing a running log, applied to a storage device. The storage device includes a target memory, a flash memory and a controller. The method of accessing a running log includes the following steps: (a) setting A buffer area of the target memory and temporarily storing a running log of the storage device in the buffer area of the target memory; (b) writing the running log in the buffer area to the A specific storage area of the flash memory, and after the writing is completed, an offset value recorded in a storage block of the target memory is modified, and the buffer area of the target memory is released to re- Temporarily storing the running log of the storage device, wherein the offset value corresponds to a location where the running log in the buffer area is written into the specific storage area; (c) every predetermined period of time Update the storage block to the flash memory; (d) when the storage device enters the initialization phase, activate a watchdog circuit of the controller; (e) when the watchdog circuit After counting a preset counting time and the storage device has not completed the initialization phase, the storage device is set to a forced low-level format mode by reading the specific storage area of the flash memory. , and then obtain the latest running log; and (f) when the storage device completes the initialization phase, close the watchdog circuit; when the watchdog circuit counts the preset counting time and the When the storage device has not completed the initialization phase, it is determined that a conversion layer of the flash memory of the storage device is damaged. As in the method for accessing the running log described in claim 1, before step (a), the method for accessing the running log further includes the following steps: when the storage device performs a low-level format operation, The offset value recorded in the storage block of the target memory is set to a preset value, and the storage block of the target memory is copied to the flash memory. As for the method of accessing the running log according to claim 1, the step (f) further includes: copying the latest storage block updated in the flash memory to the target memory, and according to The offset value recorded in the copied storage block in the target memory obtains the location where the running log is written next to the specific storage area of the flash memory. The method for accessing the running log as described in claim 1 further includes the following steps: when the storage device is powered on again after a power outage, find the latest update in the flash memory before the power outage. Store the block and copy it to the target memory, and then obtain the running log and write it to the flash memory next time based on the offset value recorded in the copied storage block in the target memory. the location of the specific storage area of the body. The method for accessing the running log as described in claim 1, step (b) further includes: writing the running log in the buffer area to the flash memory every time the buffer area is full. The specific storage area, and after the writing is completed, the offset value recorded in the storage block of the target memory is modified, and the buffer area of the target memory is released. A storage device includes a controller, a target memory and a flash memory. The target memory and the flash memory are respectively connected to the controller. The controller includes: a non-volatile A memory is used to store the program code that implements the access method of the running log; a processor is coupled to the non-volatile memory and is used to load the program code of the access method of the running log to execute the following Steps: (a) Set a buffer area of the target memory and temporarily store a running log of the storage device in the buffer area of the target memory; (b) Transfer the data in the buffer area to The running log is written into a specific storage area of the flash memory, and after the writing is completed, an offset value recorded in a storage block of the target memory is modified, and all parts of the target memory are released. The buffer area is used to re-temporarily store the running log of the storage device, wherein the offset value corresponds to a location where the running log in the buffer area is written into the specific storage area; (c ) Update the storage block to the flash memory at predetermined intervals; (d) When the storage device enters the initialization phase, activate a watchdog circuit of the controller; (e) When the storage device enters the initialization phase, When the watchdog circuit counts a preset counting time and the storage device has not completed the initialization phase, the storage device is set to a forced low-level format mode by reading the flash memory. The specific storage area, and then obtain the latest operation log; and (f) when the storage device completes the initialization phase, close the watchdog circuit; When the watchdog circuit counts the preset counting time and the storage device has not completed the initialization phase, the processor is also configured to determine that a conversion layer of the flash memory of the storage device is damaged. . The storage device of claim 6, in step (f), the processor is further configured to copy the latest storage block updated in the flash memory to the target memory. , and obtain the location where the running log is written to the specific storage area of the flash memory next time according to the offset value recorded in the copied storage block in the target memory. As for the storage device of claim 6, when the storage device is powered on again after a power outage, the processor is also used to find the latest storage area updated in the flash memory before the power outage. block and copy it to the target memory, and then obtain the next writing time of the running log to the flash memory based on the offset value recorded in the copied storage block in the target memory. The location of the specific storage area. According to the storage device of claim 6, whenever the buffer area is full, the processor is further configured to write the running log in the buffer area to the specific area of the flash memory. storage area, and after the writing is completed, modify the offset value recorded in the storage block of the target memory, and release the buffer area of the target memory.