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Operating Systems Linux C++ Code to Access Linux Hard Disk Sectors (with a LoopBack Virtual Hard Disk) Post 302491974 by shen747 on Friday 28th of January 2011 09:27:12 PM
Old 01-28-2011
Hi Corona688,

Thanks for pointing the FAT-12 issue out. I changed my disk format to FAT-16. Following is my new HEXDUMP:

Code:
$ sudo hexdump -C /dev/loop0 | head

00000000  eb 3c 90 6d 6b 64 6f 73  66 73 00 00 02 01 01 00  |.<.mkdosfs......|
00000010  02 e0 00 40 0b f0 0c 00  12 00 02 00 00 00 00 00  |...@............|
00000020  00 00 00 00 00 00 29 89  47 06 64 20 20 20 20 20  |......).G.d     |
00000030  20 20 20 20 20 20 46 41  54 31 36 20 20 20 0e 1f  |      FAT16   ..|
00000040  be 5b 7c ac 22 c0 74 0b  56 b4 0e bb 07 00 cd 10  |.[|.".t.V.......|
00000050  5e eb f0 32 e4 cd 16 cd  19 eb fe 54 68 69 73 20  |^..2.......This |
00000060  69 73 20 6e 6f 74 20 61  20 62 6f 6f 74 61 62 6c  |is not a bootabl|
00000070  65 20 64 69 73 6b 2e 20  20 50 6c 65 61 73 65 20  |e disk.  Please |
00000080  69 6e 73 65 72 74 20 61  20 62 6f 6f 74 61 62 6c  |insert a bootabl|
00000090  65 20 66 6c 6f 70 70 79  20 61 6e 64 0d 0a 70 72  |e floppy and..pr|

 

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MSDOS.UTIL(8)						    BSD System Manager's Manual 					     MSDOS.UTIL(8)

NAME
msdos.util -- DOS/Windows (FAT) file system utility SYNOPSIS
msdos.util -m mountflag1 mountflag2 mountflag3 mountflag4 device node msdos.util -p mountflag1 mountflag2 mountflag3 mountflag4 device msdos.util -u device msdos.util -k device msdos.util -n device name DESCRIPTION
The msdos.util command supports the mounting, probing, and unmounting of FAT file systems. Options: -m mountflag1 mountflag2 mountflag3 mountflag4 mount -n set name -p mountflag1 mountflag2 mountflag3 mountflag4 probe for mounting -u unmount -k print volume UUID mountflags above are either: o removable or fixed o readonly or writeable o suid or nosuid o dev or nodev FAT volumes do not actually have a volume UUID. They have an optional 4-byte volume ID. If a volume has an ID, then it will be converted to a version 3 UUID using MD5 to checksum the kFSUUIDNamespaceSHA1 UUID folowed by the volume ID. For the -k option, if the volume has a volume ID, the exit status will be 253 and the UUID will be printed to standard out, without any trailing newline. Otherwise, if the volume appears to be FAT, the exit status will be 255. If the volume does not appear to be FAT, the exit status will be 254. FILES
/System/Library/Filesystems/msdos.fs/Contents/Resources/msdos.util SEE ALSO
diskarbitrationd(8) HISTORY
Derived from the Openstep Workspace Manager file system utility programs. Darwin March 24, 2001 Darwin
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