Using a VIP 622 for about a year, along with a Seagate Freeagent 500 (Seacrate as we used to call them). During this time I had one failure, had to reformat and lost everything and this was with the sleep timer off. Since then, I unplug the power from the HD and only plug it in when I am using it. All has been ok since then.
I should have learned my lesson on Seagate, when back in the old days, they had a well known 'stickem' problem where the HD pickup arm would weld itself to the HD platter after periods of not being used. In spite of numerous reports of this problem on Compuserve (pre-internet times) they never acknowledged the problem or made replacements. It was then that I decided I would never buy a Seagate again. I was loyal to WD all these years and had no problems on any of my computers.
Saw the Seagate FreeAgent drives and figured, after all these years, quality problems should have been resolved. WRONG!
I would mever buy a Seagate drive again, and this time I mean it.
Stick with WD.