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Commande dmesg sous LINUX



Bonjour,

Deux questions : 
1) merci de bien vouloir m'expliquer (ou me dire où trouver) comment fonctionne la commande dmesg et comment interpreter les resultats de cette commande.

2) est ce grave docteur ?

scsi1 : SCSI host adapter emulation for IDE ATAPI devices
scsi : 2 hosts.
scsi0: MEDIUM ERROR on channel 0, id 1, lun 0, CDB: Read (10) 00 00 22 d3 d7 00 00 80 00 
Info fld=0x22d428, Current sd08:11: sense key Medium Error
Additional sense indicates Unrecovered read error
scsidisk I/O error: dev 08:11, sector 2282472
scsi0: MEDIUM ERROR on channel 0, id 1, lun 0, CDB: Read (6) 14 5a 5f 80 00 
Info fld=0x145a8f, Current sd08:11: sense key Medium Error
Additional sense indicates Unrecovered read error
scsidisk I/O error: dev 08:11, sector 1333840
scsi0: MEDIUM ERROR on channel 0, id 1, lun 0, CDB: Read (6) 14 5a 8f 08 00 
Info fld=0x145a8f, Current sd08:11: sense key Medium Error
Additional sense indicates Unrecovered read error
scsidisk I/O error: dev 08:11, sector 1333840
scsi0: MEDIUM ERROR on channel 0, id 1, lun 0, CDB: Read (6) 02 34 b7 80 00 
Info fld=0x234fd, Current sd08:11: sense key Medium Error
Additional sense indicates Unrecovered read error
scsidisk I/O error: dev 08:11, sector 144568
scsi0: MEDIUM ERROR on channel 0, id 1, lun 0, CDB: Read (6) 02 34 f7 08 00 
Info fld=0x234fd, Current sd08:11: sense key Medium Error
Additional sense indicates Unrecovered read error
scsidisk I/O error: dev 08:11, sector 144568
VFS: Disk change detected on device ide0(3,0)
ISO 9660 Extensions: Microsoft Joliet Level 1
ISO 9660 Extensions: RRIP_1991A


Merci pour vos réponses.
Cordialement