The WD Scorpio Black is notorious for clicking from frequent load/unloads on Linux. This is due to an energy saver feature in the firmware. It seems the Hitachi Travelstar also has this issue.
Western Digital and Hitachi have DOS utilities to adjust the settings. You have to connect the HDD to a motherboard SATA and boot from a CD/USB with the tool on it.
Western Digital wdidle 3.1.05
Hitachi Feature Tool
It took me a while to find out about these. If other makes of HDD have the same problem/solution, this thread would be a good place to post links.
Western Digital and Hitachi have DOS utilities to adjust the settings. You have to connect the HDD to a motherboard SATA and boot from a CD/USB with the tool on it.
Western Digital wdidle 3.1.05
Hitachi Feature Tool
It took me a while to find out about these. If other makes of HDD have the same problem/solution, this thread would be a good place to post links.