I need to save files from a Buffalo NAS Linkstation with two physical drives that is not working anymore (2TB each, Raid 1). Error message says:
The bad sectors in the hard drive may have reached a dangerous level. Replace the hard drive.
I removed both drives from the NAS and tried to connect the drives externally to my computer via USB adapter using the following steps:
mdadm --assemble --readonly /dev/md0 /dev/sdc6
mount /dev/md0
For drive 1 this works fine. I have access to the files. BUT: the relevant data is not available on disk 1. It seems the files were not synchronized anymore.
Unfortunately these steps do not work for the second drive. I get the following error:
mdadm: no recogniseable superblock on /dev/sdc6 mdadm: /dev/sdc6 has no superblock - assembly aborted
I am new to Linux and don't really know what to do next. Is there a chance of getting the files from the crashed drive?
Some additional information:
lsblk:
sdc 8:32 0 1,8T 0 disk
├─sdc1 8:33 0 977M 0 part
├─sdc2 8:34 0 4,8G 0 part
├─sdc3 8:35 0 1M 0 part
├─sdc4 8:36 0 1M 0 part
├─sdc5 8:37 0 977M 0 part
└─sdc6 8:38 0 1,8T 0 part
dmesg:
[ 867.209205] sdc: sdc1 sdc2 sdc3 sdc4 sdc5 sdc6
[ 867.210767] sd 3:0:0:0: [sdc] Attached SCSI disk
[ 868.000588] sd 3:0:0:0: [sdc] tag#17 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 868.000591] sd 3:0:0:0: [sdc] tag#17 Sense Key : Hardware Error [current]
[ 868.000594] sd 3:0:0:0: [sdc] tag#17 Add. Sense: Internal target failure
[ 868.000597] sd 3:0:0:0: [sdc] tag#17 CDB: Read(10) 28 00 00 1e 90 08 00 00 08 00
[ 868.000599] print_req_error: critical target error, dev sdc, sector 2002952
[ 868.000634] sd 3:0:0:0: [sdc] tag#18 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 868.000637] sd 3:0:0:0: [sdc] tag#18 Sense Key : Hardware Error [current]
[ 868.000641] sd 3:0:0:0: [sdc] tag#18 Add. Sense: Internal target failure
[ 868.000644] sd 3:0:0:0: [sdc] tag#18 CDB: Read(10) 28 00 00 b7 28 80 00 00 08 00
[ 868.000646] print_req_error: critical target error, dev sdc, sector 12003456
[ 868.000700] sd 3:0:0:0: [sdc] tag#16 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 868.000701] sd 3:0:0:0: [sdc] tag#16 Sense Key : Hardware Error [current]
[ 868.000702] sd 3:0:0:0: [sdc] tag#16 Add. Sense: Internal target failure
[ 868.000703] sd 3:0:0:0: [sdc] tag#16 CDB: Read(10) 28 00 00 1e 8f f8 00 00 08 00
[ 868.000704] print_req_error: critical target error, dev sdc, sector 2002936
[ 868.000712] sd 3:0:0:0: [sdc] tag#19 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 868.000713] sd 3:0:0:0: [sdc] tag#19 Sense Key : Hardware Error [current]
[ 868.000715] sd 3:0:0:0: [sdc] tag#19 Add. Sense: Internal target failure
[ 868.000717] sd 3:0:0:0: [sdc] tag#19 CDB: Read(10) 28 00 e7 e6 5a 58 00 00 08 00
[ 868.000718] print_req_error: critical target error, dev sdc, sector 3890633304
[ 868.000731] sd 3:0:0:0: [sdc] tag#20 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 868.000733] sd 3:0:0:0: [sdc] tag#20 Sense Key : Hardware Error [current]
[ 868.000734] sd 3:0:0:0: [sdc] tag#20 Add. Sense: Internal target failure
[ 868.000736] sd 3:0:0:0: [sdc] tag#20 CDB: Read(10) 28 00 00 b7 30 00 00 00 08 00
[ 868.000737] print_req_error: critical target error, dev sdc, sector 12005376
[ 868.000747] sd 3:0:0:0: [sdc] tag#25 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 868.000749] sd 3:0:0:0: [sdc] tag#25 Sense Key : Hardware Error [current]
[ 868.000751] sd 3:0:0:0: [sdc] tag#25 Add. Sense: Internal target failure
[ 868.000753] sd 3:0:0:0: [sdc] tag#25 CDB: Read(10) 28 00 00 d5 bf f0 00 00 08 00
[ 868.000753] print_req_error: critical target error, dev sdc, sector 14008304
[ 868.658878] sd 3:0:0:0: [sdc] tag#17 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 868.658884] sd 3:0:0:0: [sdc] tag#17 Sense Key : Illegal Request [current]
[ 868.658889] sd 3:0:0:0: [sdc] tag#17 Add. Sense: Invalid field in cdb
[ 868.658894] sd 3:0:0:0: [sdc] tag#17 CDB: Read(10) 28 00 00 1e 90 08 00 00 08 00
[ 868.658898] print_req_error: critical target error, dev sdc, sector 2002952
[ 868.658911] Buffer I/O error on dev sdc2, logical block 1, async page read
[ 868.659015] sd 3:0:0:0: [sdc] tag#16 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 868.659021] sd 3:0:0:0: [sdc] tag#16 Sense Key : Illegal Request [current]
[ 868.659026] sd 3:0:0:0: [sdc] tag#16 Add. Sense: Invalid field in cdb
[ 868.659032] sd 3:0:0:0: [sdc] tag#16 CDB: Read(10) 28 00 00 1e 8f f8 00 00 08 00
[ 868.659036] print_req_error: critical target error, dev sdc, sector 2002936
[ 868.659043] Buffer I/O error on dev sdc1, logical block 250111, async page read
[ 868.659083] sd 3:0:0:0: [sdc] tag#20 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 868.659088] sd 3:0:0:0: [sdc] tag#20 Sense Key : Illegal Request [current]
[ 868.659094] sd 3:0:0:0: [sdc] tag#20 Add. Sense: Invalid field in cdb
[ 868.659099] sd 3:0:0:0: [sdc] tag#20 CDB: Read(10) 28 00 e7 e6 5a 58 00 00 08 00
[ 868.659103] print_req_error: critical target error, dev sdc, sector 3890633304
[ 868.659109] Buffer I/O error on dev sdc6, logical block 484578123, async page read
[ 868.659131] sd 3:0:0:0: [sdc] tag#21 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 868.659136] sd 3:0:0:0: [sdc] tag#21 Sense Key : Illegal Request [current]
[ 868.659141] sd 3:0:0:0: [sdc] tag#21 Add. Sense: Invalid field in cdb
[ 868.659147] sd 3:0:0:0: [sdc] tag#21 CDB: Read(10) 28 00 00 b7 30 00 00 00 08 00
[ 868.659151] print_req_error: critical target error, dev sdc, sector 12005376
[ 868.659157] Buffer I/O error on dev sdc4, logical block 0, async page read
[ 868.659177] Buffer I/O error on dev sdc5, logical block 250110, async page read
[ 868.659195] Buffer I/O error on dev sdc3, logical block 16, async page read