I had to get four WDs in a row replaced... one was DOA when they sent it back. This was in a good working environment with decent cooling but a lot of disk activity, which apparently used the disks up in a wicked hurry. Every time I sent one back I asked for a new, not refurb, disk, and every time they said no and gave me a slightly bigger disk that would die within three months. I will no longer use WDs for any active drive (ie storage is OK with backups but they'll never be C: )
(edited for an inadvertent smiley)