JPH02307117A - Storage controller - Google Patents

Abstract

PURPOSE:To update the partial data contained in the physical record without correcting the data error produced in the logical record which is updated when the data is read out of a storage medium by updating the record within a storage circuit after deciding the presence/absence of an error included in the logical record to be updated. CONSTITUTION:A microprogram control circuit 10 is prepared together with a channel adaptor circuit 20, a storage circuit 30, an error position detecting circuit 40, and a device adaptor circuit 50. Then the partial data of the physical record including a data error in the physical record to be updated on a recording medium is updated when the updated data stored in the circuit 30 is written again to the recording medium. As a result, the partial data included in the physical record can be updated without correcting the read error produced in the logical record to be updated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a storage control device.

[Conventional technology]

Conventionally, there have been storage control devices that make it possible to update some data in a physical record on a recording medium.

[Problem to be solved by the invention]

However, in conventional storage control devices, if a data error occurs in a logical record that should be updated when reading a physical record, some data in the physical record cannot be updated unless the error is corrected. there were.

[Means to solve the problem]

In the present invention, data read from a recording medium is temporarily stored in a storage circuit, an error position detection circuit detects the error position, and when an error exists in a logical record to be updated, a channel adapter circuit stores the data. The above drawback is solved by updating part of the data in the circuit with the data transferred from the channel and then writing the data in the storage circuit back to the recording medium, so that a reading error is not detected in the logical record to be updated. The present invention provides a device that can update some data in a physical record without correcting an error.

In other words, the present invention provides a memory circuit that temporarily stores data read from a recording medium, and a memory circuit that temporarily stores data read from a recording medium, and detects whether an error is included in a logical record to be updated of data stored in the memory circuit when reading from the recording medium. an error position detection circuit for determining whether the The method is characterized in that a portion of data in a physical record containing a data error in the logical record to be updated on the recording medium is updated by writing back.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram showing in block form one embodiment of the present invention. Referring to FIG. 1, the storage control device of the present invention includes a microprogram control circuit 10, a storage circuit 30, which temporarily stores data read from a recording medium or data transferred from a channel. A channel adapter circuit 20 that transfers data to and from the channel and loads the data into the storage circuit 30. A device adapter circuit 50 that transfers data to and from a recording medium (device), reads data into the storage circuit 30, and takes out data in the storage circuit 30 and transfers it to the device. It is comprised of an error position detection circuit 40 that detects a data error when reading data from a recording medium and creates error position information.

Next, the functions and operations of the constituent elements of the above embodiment will be specifically explained. 1 consisting of multiple logical records
When receiving a command to update some logical records in a physical record recorded with one error detection and correction code added to one physical record, the microprogram control circuit 10 updates the physical record specified by the command. It executes a microinstruction to read from the recording medium, activates the device adapter circuit 50 through the signal line 150, and sends a device command. The device adapter circuit 50 issues the received device command to the device through the signal line 500, stores the data transferred from the device in the storage circuit 30 through the signal line 350,
At the same time, it is sent to the error position detection circuit 40 through a signal line 450.

When the error position detection circuit 40 detects that there is an error in the data read from the recording medium, it notifies the microprogram control circuit 10 through the signal line 140 and creates error position information. When the microprogram control circuit 10 learns that a data error has been detected by the error position detection circuit 40, it receives the error position information from the error position detection circuit 40 through the signal line 140, and updates the data in the logical record specified by the command to be updated. It is determined whether there is an error or not, and if there is an error in the logical record to be updated, a microinstruction for updating the data in the storage circuit 30 is executed, and the channel adapter circuit 20 is sent through the signal line 120. to start. The channel adapter circuit 20 receives data to be updated from the channel and sends it to the storage circuit 3 through a signal line 230.
Update the logical record part of the data in 0 to be updated.

When the data update is completed, the microprogram control circuit l
O executes the microinstruction to write back onto the recording medium again, activates the device adapter circuit 50 through the signal line 150, and sends a device command. The device adapter circuit 50 sends the received device command to the device through the signal line 500, reads the updated data from the storage circuit 30 through the signal line 350, sends it to the device through the signal line 500, and writes it back onto the recording medium. If there is a data error in the logical record that is updated when a data error occurs, it is possible to update some of the logical records in the physical record.

In the embodiment shown in FIG. 2, an error correction circuit 60 for creating correction information when an error is detected during data reading is added to the circuit shown in FIG. 1. By adding the error correction circuit 60, when an error exists outside the logic code to be updated, if the error is a correctable data error, the logic record section to be updated is updated after the error is corrected, and the recording is performed. If a data error occurs that can be corrected even outside the logical record to be updated by writing it back onto the medium, some of the logical records within the physical record can be updated.

〔Effect of the invention〕

As explained above, the present invention determines whether or not there is an error in the logical record to be updated, and updates the logical record in the storage circuit when reading data from the recording medium. This has the advantage that when a data error occurs, it can be updated without correcting the error.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing in block form one embodiment of the invention, and FIG. 2 is a circuit diagram showing another embodiment of the invention. 10...Micro program control circuit, 20.
... Channel adapter circuit, 30 ... Memory circuit, 40 ... Error position detection circuit, 50 ...
...Device adapter circuit, 60...Speech correction circuit.

Claims (1)

[Claims] A storage circuit that temporarily stores data read from a recording medium and a logical record to be updated of data stored in the storage circuit when reading from the recording medium to determine whether an error is included. an error position detection circuit for
a channel adapter circuit that updates part of the data in the storage circuit with data transferred from the channel, and updates the data on the recording medium by writing the updated data in the storage circuit back onto the recording medium. 1. A storage control device that updates part of data in a physical record that includes a data error in a logical record.