IS THIS A BAD HARDDRIVE

EVERY WEEK OR SO,THIS FRIEND OF MINE KEEPS CALLING ME AND TELLING ME TO LOOK AT HIS COMPUTER. WHAT KEEPS HAPPENING IS, IT KEEPS LOSING ITS PARTITIONS.ONCE A WEEK FOR ABOUT 1 MONTH I HAVE TO GO OVER AND REPARTITION, FORMAT AND INSTALL AND OS. THANKYOU FOR YOUR HELP………..