I had been seeing a lot of beachballs so I took a look at Disk Utility and it tells me that "This drive has a hardware problem that can't be repaired. Back up as much data as possible and replace the disk. See an authorized Apple Dealer for more information." The drive is identified as "1TB ST31`000528AS Media" and is in a late 2010 iMac. At the bottom of the window it says S.M.A.R.T. Status: Failing I have a daily clone drive made by CarbonCopyCloner.app so I should be OK on the backup but I am a little concerned about getting the work done as I am in Vietnam and the only time I visited the authorized (but 3d party) repair place I could not find anybody that spoke any English and my local wife has about zero tech vocabulary. How hard would it be to replace the drive myself?