# ls -l /dev/block/sd?
brw------- 1 root root 8,   0 2019-07-14 15:16 /dev/block/sda
brw------- 1 root root 8,  16 2019-07-14 15:16 /dev/block/sdb
brw------- 1 root root 8,  32 1970-01-03 18:13 /dev/block/sdc
brw------- 1 root root 8,  48 1970-01-03 18:13 /dev/block/sdd
brw------- 1 root root 8,  64 2019-07-14 15:16 /dev/block/sde
brw------- 1 root root 8,  80 1970-01-03 18:13 /dev/block/sdf