I also can testify of this behaviour (with my iRiver E10).

lsusb lists the device:
Bus 005 Device 004: ID 1006:3010 iRiver, Ltd.

dmesg reports (when you simply plug it in):
[ 7596.378642] usb 5-5: USB disconnect, address 4
[ 7600.871920] usb 5-5: new high speed USB device using ehci_hcd and address 5
[ 7601.006086] usb 5-5: configuration #1 chosen from 1 choice
[ 7601.032619] scsi4 : SCSI emulation for USB Mass Storage devices
[ 7601.043068] usb-storage: device found at 5
[ 7601.043075] usb-storage: waiting for device to settle before scanning
[ 7606.066755] usb-storage: device scan complete
[ 7606.070856] scsi scan: INQUIRY result too short (5), using 36
[ 7606.070856] scsi 4:0:0:0: Direct-Access                                    
PQ: 0 ANSI: 0
[ 7606.110934] sd 4:0:0:0: [sdb] Sector size 0 reported, assuming 512.
[ 7606.110934] sd 4:0:0:0: [sdb] 1 512-byte hardware sectors (0 MB)
[ 7606.146602] sd 4:0:0:0: [sdb] Write Protect is off
[ 7606.146602] sd 4:0:0:0: [sdb] Mode Sense: 03 00 00 00
[ 7606.146602] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[ 7606.147205] sd 4:0:0:0: [sdb] Sector size 0 reported, assuming 512.
[ 7606.147215] sd 4:0:0:0: [sdb] 1 512-byte hardware sectors (0 MB)
[ 7606.153305] sd 4:0:0:0: [sdb] Write Protect is off
[ 7606.153305] sd 4:0:0:0: [sdb] Mode Sense: 03 00 00 00
[ 7606.153305] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[ 7606.153305]  sdb:
[ 7606.774347] sd 4:0:0:0: [sdb] Attached SCSI disk
[ 7606.774441] sd 4:0:0:0: Attached scsi generic sg2 type 0

When you attempt to force a mount (since Nautilus will NOT) using sudo mount -v 
-t vfat -o noatime /dev/sdb <dir>:
mount: /dev/sdb: can't read superblock

With dmesg reporting:
[ 7682.235009] attempt to access beyond end of device
[ 7682.235009] sdb: rw=0, want=2, limit=1
[ 7682.235009] FAT: bread failed, FSINFO block (sector = 1)

It is important to note that Hardy works (both installed and live cd),
and that this is a regression.

Kind Regards,
Matthew

-- 
not possible to mount usb memory sticks or mp3 devices
https://bugs.launchpad.net/bugs/251781
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