Lost Another Harddisk

Another harddisk died recently.  This was a 2TB Seagate that I installed February of 2012.  At first, I started getting I/O errors.  I forced remount and it was running again.  I wanted to run an xfs_check on it, but the forced unmount made it look like it was still mounted, so xfs_check refused to run.  I decided to reboot, but the computer didn't come back up.  I transferred my HDMI cable (I don't have a switch yet) and noticed that it was hung on the "Mounting local filesystems" screen.  I decided to shut off the computer and take out the problem hard disk.  The computer had 6 hard disks, but luckily the case made it easy to take disks out and identify which one was which.  I tried plugging the disk into a SATA->USB converter, but it started beeping at me.  I tried a second time, and I could hear the disk try to start up.  It started beeping again.  Luckily, I didn't lose a lot of data.  Most of the data was mirrored onto other hard disks.