How to check if a disk is SSD or HDD

Linux will detects SSD automatically. Since kernel version 2.6.29, you can check /dev/sda with following command

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# cat /sys/block/sda/queue/rotational

The return number 0 shows you /dev/sda is a SSD, and 1 shows it is a HDD. Note that this command may not work when your disk is created by hardware RAID.

Another way is to use lsblk command, a part of the util-linux package.

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# lsblk -d -o name,rota
NAME ROTA
sda     0
sdb     1

ROTA means rotational device, 1 for true, 0 for false. This command report the same information as in /sys/block/.../queue/rotational

Ref : How to know if a disk is an SSD or an HDD