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mkdosfs - Make DOS file system utilty.


I wrote this, partially to complement the dosfsck utility written by Werner
Almesberger (who graciously gave me some pointers when I asked for some
advice about writing this code), and also to avoid me having to boot DOS
just to create data partitions (I use Linux to back up DOS :-) ).

The code is really derived from Remy Card's mke2fs utility - I used this as a
framework, although all of the file system specific stuff was removed and the
DOS stuff inserted.  I believe originally mke2fs was based on Linus' mkfs
code, hence the acknowledgements in the source code.

Neither Remy nor Linus have had any involvement with mkdosfs, so if there are
any bugs they're almost certainly "all my own work".

The code has been available for ftp since 1st September 1993, and I have yet
to receive any bug reports from users.  I don't know of any bugs, but if you
do find a bug or have any constructive comments, please mail me!

The only bug I found with version 0.1 was an obscure fault that could lead
to an invalid (for MS-DOS, not Linux's dos fs) number of sectors used in the
file allocation table(s).


Dave Hudson
dave@humbug.demon.co.uk


FAT32 support
=============

mkdosfs now can also create filesystems in the FAT32 format. To do this, 
give mkdosfs a "-F 32" option. If -F isn't specified, FAT32 is automatically
selected for volumes >= 512 MiB; otherwise, FAT12 or FAT16 is selected.

- Mathwi 


With FAT32 you have two additional options, -R to select the number of re-
served sectors (usually 32), and -b to select the location of the backup boot 
sector (default 6). Of course such a backup is created, as well as the new 
info sector. 

On FAT32, the root directory is always created as a cluster chain. There's no 
option to generate an old static root dir.

One bigger bug fix besides FAT32 was to reject filesystems that need a
16 bit FAT to fit all possible clusters, but the bigger FAT needs some
more sectors, so the total number of clusters drop below the border
where MS-DOS expects a 12 bit FAT. So such filesystems would be FAT16,
but interpreted as FAT12 by DOS. The fix is to reduce filesystem size
a bit.

- Roman <roman@hodek.net>

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