I am about to RMA my WD Caviar Green 3 TB WD30EZRS HDD that I bought last year (it still has a few months of warranty remaining on it). It was GPT formatted as a single volume, to store my photos and videos. I went out of town on June 22, leaving my computer turned off. When I returned on June 23, my computer on boot up found corrupt and unreadable file record segments and corrupt attribute record on the drive. I was unable to access the drive, even after CHKDSK ran. None of WD's support steps or tools helped. Fortunately, I found software that was able to recover my entire directory and file structure, which I backed up to an external FD Gforce 3 TB HDD. My internal drive remained generally inaccessible to the OS (though I could access it through Drive Management) until I deleted and recreated the partitions on it. WD's Lifeguard S.M.A.R.T. tool reports the drive is healthy, and all drive metrics look strong. I don't trust this drive, anymore, though, so I'm returning it. WD sent me a WD30EZRX as replacement.
I am curious what caused the errors? File record segments 64 to more than 100 were unreadable by Windows 7 (64). What caused that? I actually used 2 data recovery tools, by 2 different companies. The first one recovered most of my data, but many of the files were corrupted. The second was able to recover everything intact, but it took 2 days to do it. Now that I've wiped out and restored the drive, it appears to be working normally, in perfect health. What would do that?