My WD is a model WDH2Q20000N My Book Studio Edition II... it worked fine for more than a year with no issues. I would agree that if I had gone to Best Buy and bought a drive and it turned out to be not compatible -- I would not expect support for that. But to send out a software / data update that killed 1/3 of HR's with external drives (based on the survey in this thread) would seem to implicate D* with some degree of accountability.
Drive passed extended test with no issues and is about 30% thru its 2nd 18 hour scan...next step is to zero the data and see if that works.
Not many people have gotten the My Book eSATAs to work. I gotta feeling you might have been lucky, real lucky, to have it work for a year. I bought a My Book when it first came out and I think I might have been the first to post about them on the forum. I called WD and asked them why it wouldn't work and they told me that no My Book eSATA would work with a DVR. You're probably the third or fourth person that I've seen post that actually had one work.
I do agree with you about the accountability of D* when it comes to wrecking eSATAs. But, without support, it's always been a crapshoot.