1. Open Terminal Emulator.
2. Type hdparm -t /dev/sd? (sd? can be sda, sdb etc, please refer to Disk, Raid in Elsview) and Enter.
Reminder: Please turn off all the client PC before checking. The testing result might not accurate if client PC is booting.
REFERENCE: Normal speed for different type of hard disk.
*SSD in SATA 3.0: 430Mb/s-530Mb/s
*NVMe: 1450MB/s- 1700Mb/s
Please change a new hard disk if drop below 50% of normal speed.