check ssd or hdd linux 1

check ssd or hdd linux

$ cat /sys/block/sda/queue/rotational

#If the output is 1, the disk is HDD.
#If the output is 0 (zero), the disk is SDD.
#Because, SSDs won't rotate. So the output should be zero
# if you have SSD in your system.

Here is what the above code is Doing:
1. The /sys/block/sda/queue/rotational file contains a single number.
2. If the number is 1, the disk is a hard disk drive (HDD).
3. If the number is 0, the disk is a solid-state drive (SSD).

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