Re: ...

non justement il n'y a pas de /dev/sda1 à la place il y a du sdb: voici cue donne dmesg | grep sdb (dmesg | grep sda ne donne rien)

sdb: Unit Not Ready, sense:
SCSI device sdb: 128000 512-byte hdwr sectors (66 MB)
sdb: assuming Write Enabled
sdb: assuming drive cache: write through
SCSI device sdb: 128000 512-byte hdwr sectors (66 MB)
sdb: assuming Write Enabled
sdb: assuming drive cache: write through
 sdb: sdb1
Attached scsi removable disk sdb at scsi5, channel 0, id 0, lun 0
sdb: Unit Not Ready, sense:
SCSI device sdb: 128000 512-byte hdwr sectors (66 MB)
sdb: assuming Write Enabled
sdb: assuming drive cache: write through
SCSI device sdb: 128000 512-byte hdwr sectors (66 MB)
sdb: assuming Write Enabled
sdb: assuming drive cache: write through
 sdb: sdb1
Attached scsi removable disk sdb at scsi6, channel 0, id 0, lun 0
VFS: Can't find a valid FAT filesystem on dev sdb.
sdb: Unit Not Ready, sense:
SCSI device sdb: 128000 512-byte hdwr sectors (66 MB)
sdb: assuming Write Enabled
sdb: assuming drive cache: write through
SCSI device sdb: 128000 512-byte hdwr sectors (66 MB)
sdb: assuming Write Enabled
sdb: assuming drive cache: write through
 sdb: sdb1
Attached scsi removable disk sdb at scsi7, channel 0, id 0, lun 0
sdb: Unit Not Ready, sense:
SCSI device sdb: 128000 512-byte hdwr sectors (66 MB)
sdb: assuming Write Enabled
sdb: assuming drive cache: write through
SCSI device sdb: 128000 512-byte hdwr sectors (66 MB)
sdb: assuming Write Enabled
sdb: assuming drive cache: write through
 sdb: sdb1
Attached scsi removable disk sdb at scsi8, channel 0, id 0, lun 0

J'ai essayé en changeant sda1 en sdb1 mais ça n'a rien changé d'autre.