Sorry about that. I did some checking on your problem, and pardon me while I ask the obvious: have you checked to make sure you're on the most recent firmware? You can do that here: http://www.samsung.com/us/support/SupportOwnersFAQPopup.do?faq_id=FAQ00000236&fm_seq=404
If that fixes it, great! Please let me know if it doesn't.
-- HD Tech
This occurred three times in two days. Even when I restart Windows, the drive cannot be seen in the BIOS until the drive is powered off and on. This reminds me of the infamous problem of OCZ SSDs.
Anyone else having this problem?