I've a 500 GB internal hard disk. Now since yesterday I hear beeping sound from disk for 10 minutes and then partitions on it would disappear.
I also saw this error : The driver detected a controller error on \Device\Ide\IdePort2.
I tried rebooting many times but same result. Only once did I hear some friction noise in the hard disk for a couple of minutes.
Today I booted again and it work normally for 2-3 hours and the same problem started and partitions disappeared.
Though I've backed up everything on it, what could be the problem?