判斷linux系統上的盤是ssd還是hdd的方法

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 is not exact in the onecloudsystem pluged in with a usb hard drive.

           

Use smartctl (install by installing smartmontools) to retrieve vendor information,

sudo smartctl -a /dev/sdb

If you see a line like this,

Rotation Rate: Solid State Device

           

it is about reading random data from the drive and assessing the time.

time for i in `seq 1 1000`; do
    dd bs=4k if=/dev/sda count=1 skip=$(( $RANDOM * 128 )) >/dev/null 2>&1;
done
here are my results for SSD

real    0m1.375s
user    0m0.285s
sys     0m0.944s
and HDD

real    0m14.249s
user    0m0.752s
sys     0m6.284s

           

lsblk -d -o name,rota; 
           

smartctl --all /dev/sda1 -d sat ;
           

cat /proc/scsi/scsi