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1) List of Block Devices
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NAME     ALIGNMENT MIN-IO OPT-IO PHY-SEC LOG-SEC ROTA SCHED       RQ-SIZE  RA WSAME HCTL       PATH
sda              0   4096      0    4096     512    1 mq-deadline      64 128    0B 1:0:0:0    /dev/sda
└─sda1           0   4096      0    4096     512    1 mq-deadline      64 128    0B            /dev/sda1
sdb              0    512      0     512     512    0 mq-deadline      64 128    0B 0:0:0:0    /dev/sdb
├─sdb1           0    512      0     512     512    0 mq-deadline      64 128    0B            /dev/sdb1
├─sdb2           0    512      0     512     512    0 mq-deadline      64 128    0B            /dev/sdb2
├─sdb3           0    512      0     512     512    0 mq-deadline      64 128    0B            /dev/sdb3
└─sdb4           0    512      0     512     512    0 mq-deadline      64 128    0B            /dev/sdb4
  └─sdb4         0    512      0     512     512    0                 128 128    0B            /dev/mapper/sdb4
sdc              0    512      0     512     512    1 mq-deadline      64 128    0B 4:0:0:0    /dev/sdc
└─sdc1           0    512      0     512     512    1 mq-deadline      64 128    0B            /dev/sdc1
sdd              0    512      0     512     512    1 mq-deadline      64 128    0B 5:0:0:0    /dev/sdd
└─sdd1           0    512      0     512     512    1 mq-deadline      64 128    0B            /dev/sdd1
