Are those Hard Drives on the Marvell controller? If so, I have the same problem (with the latest BIOS version). I have an open ticket to address this issue with Intel. They still have not resolved it (shocking). It WAS addressed in a previous BIOS revision. Intel for the Win on screwing up a fix! *sigh*
Thanx for your reply, seems like I'm not the only one. Interestingly, yes bot of them are. I've moved the one HDD that I use more often to an Intel SATA controller to lessen the SATA disappearances. I'll have to wait and see. So far no missing SATA ports since last night. I have to say it seemed like it mostly occurred when transferring data to and from both HDDs at the same time.
I have to honestly say I'm very far from impressed with this Z77GA70K mainboard. It was supposed to come with a USB3.0 hub, which it didn't. The first time I started her up she refused to boot, I had to change the Ram to different slots after every restart to get it to boot. I done the early November bios update and at least it solved that issue. I added another Kingston 4GB 1333Mhz piece of Ram (slot 1 & 3) and bam!!! Instant BSOD. Ran mem test, no issues? Changed the Ram to slot 2 & 4, no more BSOD, but explorer crashes at least once a day. Sometimes it takes very long to shut down. I've also had it freeze on me at least 4 times on the Intel logo at start up. Now 4 times may not sound like much, but this is an Intel mainboard, this type of behaviour is very un-common for them. I'd expect it from a Foxconn or Azrock mainboard, but not an Intel.
M/B - Intel Z77-GA70K
CPU - Intel i5 2500 (Sandy Bridge)
RAM - 2 x Kingston 4GB 1333MHz
HDD - 1 x Intel 60GB SSD 330 (C Drive)
HDD - 5 x Seagate HDDs (2TB, 2TB, 1TB, 750GB, 500GB)
DVD - 2 x (Pioneer, Liteon)
Card Reader - Vantec 4x USB3.0 Hub & USB2.0 Card reader
PSU - Huntkey 550W
Win 7 x64 Ultimate
BIOS and all drivers currently up to date. System is not over clocked and BIOS is stock standard.