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One hard drive (/dev/sdb) appears to be malfunctioning, though still detected:

$ lsblk 
NAME    MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda       8:0    0   1,8T  0 disk  
├─sda1    8:1    0   512M  0 part  
│ └─md0   9:0    0 511,4M  0 raid1 /boot
└─sda2    8:2    0   1,8T  0 part  
  └─md1   9:1    0   1,8T  0 raid1 /
sdb       8:16   0   1,8T  0 disk  
├─sdb1    8:17   0   512M  0 part  
│ └─md0   9:0    0 511,4M  0 raid1 /boot
└─sdb2    8:18   0   1,8T  0 part  
  └─md1   9:1    0   1,8T  0 raid1 /

smartctl doesn't show any data:

smartctl -T permissive -x /dev/sdb
smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.9.0-8-amd64] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

Short INQUIRY response, skip product id
Read Cache is:        Unavailable
Writeback Cache is:   Unavailable

=== START OF READ SMART DATA SECTION ===
SMART Health Status: OK
Current Drive Temperature:     0 C
Drive Trip Temperature:        0 C

Read defect list: asked for grown list but didn't get it
Error Counter logging not supported

Device does not support Self Test logging
Device does not support Background scan results logging

Is there any chance to retrieve serial number or any other data from hdd's .M.A.R.T at this stage?

  • Try with a shorter, simpler (for the disk) command: smartctl -i /dev/sdb – shodanshok May 13 at 10:16

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