cant mount usb disk

dmesg
[code]
..........
Attached scsi removable disk sdb at scsi2, channel 0, id 0, lun 0
SCSI device sdb: 512000 512-byte hdwr sectors (262 MB)
sdb: Write Protect is off
/dev/scsi/host2/bus0/target0/lun0: unknown partition table
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 4
..........
[/code]

[code]
# mount -t ext3 /dev/scsi/host1/bus0/target0/lun0/disc /mnt/usb
mount: wrong fs type, bad option, bad superblock on
/dev/scsi/host1/bus0/target0
/lun0/disc,
or too many mounted file systems
[/code]

the usb disk had been formated to ext3, and the kernel supports ext3


.

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