Western Digital Green Disk on Ubuntu
Dec 12, 2013
Technology
The WD20EARS (and other sizes include 1.0 and 1.5 TB driver in the series) will attempt to park the read heads once every 8 seconds FOR THE LIFE OF THE HDD which is just horrible! To see if you are affected use the smartctl command (part of smartmontools). If the last column changes rapidly, this section applies to your drive.
# smartctl /dev/sdb -a | grep Load_Cycle
193 Load_Cycle_Count 0x0032 001 001 000 Old_age Always - 597115
We have to disable this feature. Add lines to /etc/rc.local
hdparam -S 242 /dev/sda
exit 0
The effect for upper comand is listed as:
# hdparm -S 242 /dev/sda
/dev/sda:
setting standby to 242 (1 hours)
By default the disk will standby when 1 hours reached, that will avoid our disk from broken.