01-28-2011
Hi Corona688,
Thanks a lot for pointing that out. I've been doing some reading & now I feel going for the FAT-12(classical floppy disk) format file system would be the best idea as it was the 1st form of FAT introduced to the world & I guess therefore it would be much simpler & easier to implement. I read that in FAT-12 the Floppy Disk Drive's blocks are stored in a linked list style data structure & that there will be a root block containing the logical address of the next contiguous block of a file & that contiguous block containing the logical address of the next block on the floppy disk drive & so on. I guess I could try to implement this using a simple linked list data structure using c together with the FAT
![Smilie Smilie](https://www.unix.com/images/smilies/smile.gif)
.
I'll be going through the pointers you've given me so far & getting started on this. Thank you so much for helping me get this far
![Smilie Smilie](https://www.unix.com/images/smilies/smile.gif)
.
---------- Post updated 01-28-11 at 05:49 AM ---------- Previous update was 01-27-11 at 11:20 PM ----------
Hi All,
I found
this explaining how to write a file to a FAT-12 file system. But I'm still finding trouble finding a basic code to get me started on this. Can anyone of you help me out here please ?.
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PREP(8) System Manager's Manual PREP(8)
NAME
prep, format - prepare hard and floppy diskettes
SYNOPSIS
disk/prep [ -ra ] special [ type ]
disk/format [ -t type ] [ -f ] [ -d ] [ -b bfile ] [ -c csize ] [ -l label ] drive [ files ... ]
DESCRIPTION
A partition table is stored on a hard disk to specify the division of the physical disk into a set of logical units. On Plan 9 the parti-
tion table is a list of triples: name, starting sector, and ending sector. The kernel fabricates the first two partitions, disk and parti-
tion; the disk partition records the starting and ending sectors for the whole disk, and the partition partition, typically the last sector
on the disk, holds the partition table itself.
Special is the maximal prefix of names of the logical units on the disk, for example #w/hd0. Prep reads and prints the associated parti-
tion table and then enters a simple interactive mode to control editing the table.
The options are:
-r (read only) prohibits writing the table on disk.
-a automatically create default partitions if no partition table already exists. These include partitions for DOS, a boot kernel, an
NVRAM substitute, a kfs(4) file system, and, if room remains, a swap partition.
Format prepares for use the floppy diskette in the disk file named drive, for example /dev/fd0disk. The options are:
-f Do not physically format the disc. Used to install an MS-DOS filesystem on a previously formatted disc. With this option, drive can
be a plain file.
-t specify a density and type of disk to be prepared. The possible types are:
31/2DD 31/2" double density, 737280 bytes
31/2HD 31/2" high density, 1474560 bytes
51/4DD 51/4" double density, 368640 bytes
51/4HD 51/4" high density, 1146880 bytes
The default is the highest possible on the device, unless -f is used, in which case the default is 31/2HD.
-d add MS-DOS parameter block, file access table (FAT), and root directory to the start of the floppy.
The remaining options have effect only when -d is specified:
-b use the contents of bfile as the bootstrap block installed in sector 0.
-c use a DOS cluster size of csize sectors when creating the DOS FAT.
-l add a label when creating the DOS parameter block.
Again under -d, any files listed are added, in order, to the root directory of the MS-DOS filesytem. The files are contiguously allocated
and created with the READONLY attribute set.
The file /sys/src/boot/pc/bb is an example of a suitable bfile to make the disk a boot disk. It gets loaded by the BIOS at 0x7C00, reads
the root directory into address 0x7E00, and looks at the first root directory entry. If that file is called B.COM, it uses single sector
reads to load the file into address 0x10000 and then jumps to the loaded file image.
EXAMPLE
Create a Plan 9 boot floppy on a previously formatted diskette:
disk/format -f -b bb -d /dev/fd0disk /386/b.com
SOURCE
/sys/src/cmd/disk/prep.c
/sys/src/cmd/disk/format.c
/sys/src/boot/pc/bb.s
SEE ALSO
floppy(3), wren(3), b.com(8)
PREP(8)