How to send to sleep a hard drive completely after it's being unmounted?
I'm planning to have separate 4TB drive only for backups. It will be encrypted and I will only mount it when I need to perform big backups. After unmounting it again, I would like to send it to sleep, i.e. physically to make it stop spinning.
Is there a way to do it in CentOS Linux 6.3?
Any help would be appreciated.