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

bash_bob

I want to know whether a disk is a solid-state drive or hard disk. lshw is not installed. I do yum install lshw and it says there is no package named lshw. I do not know which version of http://pkgs.repoforge.org/lshw/ is suitable for my CentOS. I search the net and there is nothing that explain how to know whether a drive is SSD or HDD. Should I...

Originally asked by user4951 on Stack Exchange (unix) (CC BY-SA 3.0).

uphilltech

Good Linux question — answering as the UphillTech team:

Linux automatically detects SSD, and since kernel version 2.6.29, you may verify sda with: cat /sys/block/sda/queue/rotational You should get 1 for hard disks and 0 for a SSD. It will probably not work if your disk is a logical device emulated by hardware (like a RAID controller). See this answer for more information about SSD partitioning, filesystem...

Full answer by Totor: https://unix.stackexchange.com/a/65602 (CC BY-SA 3.0).

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