I have a 1TB hard disk used as a backup/storage drive. I had all 1TB formatted to NTFS so I could access the files (music and vids, etc) on my Windows partition. While ago I decided to check the SMART data and discovered that the "reallocated sector count" is sitting at 2510 bad sectors. There is also a "current pending sector count" of 1 (implying one sector cannot be allocated).
So, I decided to do a format the entire drive to ext4 so I could backup some Linux stuff (don't really care about the stuff the drive has on it now). Anyway, I opened Gparted, deleted the NTFS partition and formatted the whole drive with one ext4 partition. Now, here's the weird thing. Whenever I mount the partition using "mount" the first directory i see is a directory that was on my NTFS partition! This directory has 20-30 gaming videos that I put on it back when it had the NTFS partition. Somehow they survived a format to ext4.
Now my assumption is that since I am getting sector errors, that the drive has some internal failsafe mechanism and moved my data to a separate partition created by the drive somehow. Problem is this partition is not visible to either fdisk or gparted. Before I did any formatting of the disk, I looked at fdisk -l and saw a partition called "DiskSecure." I Googled it and indeed it seems this "DiskSecure" partition is some sort of mechanism the drive manufacturer built-in to move data to if a hardware error is encountered. But, now, after the format to ext4, the Windows files still exist (and can be viewed) but the "DiskSecure" partition is no longer visible to Gparted or Fdisk.
So, whats up with this? Any ideas? I would prefer to ust wipe the entire disk and start over at this point (assuming the disk isn't beyond repair, which it probably is).