I currently using RHEL5, and iscsi-target, it works well with remote machines like windows XP, the situation is like this

i created a file sharedist4.img by dd command, and formatted it from remote windowsXP box to a fat32 disk, i can copy files to it. Now i want to mount the file locally, i can see the img detail:

[root@hk backup]# file /backup/sharedisk4.img
/backup/sharedisk4.img: x86 boot sector, Microsoft Windows XP MBR, Serial 0x4a656f3b; partition 1: ID=0xc, starthead 1, startsector 63, 41929587 sectors, extended partition table (last)\011

and i mkdir /disk1 and use mount command:

[root@hk backup]# mount -t vfat -o loop /backup/sharedisk4.img /disk1
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

i don't why it has anything to do with /dev/loop0, and dmesg shows:

hfs: unable to find HFS+ superblock
hfs: unable to find HFS+ superblock
FAT: invalid media value (0xb9)
VFS: Can't find a valid FAT filesystem on dev loop0.
FAT: invalid media value (0xb9)
VFS: Can't find a valid FAT filesystem on dev loop0.
FAT: invalid media value (0xb9)
VFS: Can't find a valid FAT filesystem on dev loop0.

anyidea?