Check rotational status of all block devices

for f in /sys/block/sd?/queue/rotational; do printf "$f is "; cat $f; done

Checks and displays whether each block device (e.g., /dev/sda, /dev/sdb) is rotational (HDD) or non-rotational (SSD) by reading from /sys/block/*/queue/rotational.

system monitoring [kb:38]