Thanks for that...good info. Based on their own web site, they are clearly marketing them as two different products. The WD10EVCS is specifically for A/V, DVR use whereas the WD10EACS is simply geared toward "normal" PC and eSATA computer use. There aren't many specification differences other than the DVR/WD10EVCS lists it's idle mode and seek mode as being a bit quieter; 24dBA/25dBA as opposed to the PC/WD10EACS's 25dBA/27dBA. Ours (WD10EACS) was very quiet stock and after changing the AAM setting to 128, slightly quieter. I'd wager that's what they've done with the newer DVR specific model. The only other thing I noticed on the newer DVR model was a feature called "SilkStream" which supposedly optimizes the drive for "smooth, continuous digital video playback of up to twelve simultaneous HD streams." Now if we could only get our TiVo's to that! Other than that the specs are just about identical, so the CSR you spoke with would seem to be right...they are just about identical. The real question is if the "new" (WD10EVCS) drive will be compatible with all TiVo's, internally and as an eSATA drive or display the same soft reboot issue when used as an internal upgrade on the Series3's. Hopefully nothing new will appear regarding their use w/TiVo HD's!