si, ma questa è la risposta, ho riportato anche il dmesg:

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debian:/home/loris# mount -t vfat /dev/sda1 /media/usba
mount: wrong fs type, bad option, bad superblock on /dev/sda1,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

debian:/home/loris# dmesg | tail
sda: assuming drive cache: write through
SCSI device sda: 12000556 512-byte hdwr sectors (6144 MB)
sda: Write Protect is off
sda: Mode Sense: 03 00 00 00
sda: assuming drive cache: write through
sda: sda1
sd 1:0:0:0: Attached scsi disk sda
usb-storage: device scan complete
FAT: bogus number of reserved sectors
VFS: Can't find a valid FAT filesystem on dev sda1.
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può essere che la penna sia rotta?