i have 2 internal and 2 external hard drives on my compu. i usually keep the external ones switched on only when needed. i've noticed that one of them, which might have been idle for hours, suddenly starts making a switch-on sound whenever i delete, save or move a file on my compu, even if it's on one of the internal drives. this slows the deleting/saving down, and makes me really suspicious.
any insights more than welcome as this has been bugging me for years... thanks.