I've been running a small home NAS system for a few years now. When I first got it, I loaded it with some WD Green drives, and they've been pretty sturdy. However, one of them is starting to give me SMART warnings and I'd like to replace it before it brings my little RAID to its knees. Looking around newegg, etc., I'm seeing a class of hard drive that wasn't around when I first setup my NAS: NAS and Enterprise drives. WD and Samsung both seem strong here. I'm wondering, is a hard drive classed as a "NAS Drive" a significant thing? Is there really optimization that helps a drive survive NAS duty, or is it just a label meant to attract customers? Do any NAS owners have experience with this class of drive, and would you recommend it? Thanks!