The mystery of the disappearing, reappearing HDDs

I recently installed an OCZ Vertex 4 128gb SSD as a boot drive and it works without issue. However, the two HDDs that I use for storage are now disappearing from windows randomly. One is a SG 2TB 7200RPM 64MB cache, and the other is a WD 1TB black. Sometimes one will disappear, sometimes the other, and sometimes both. It's not consistently one or the other. The SSD has not ever disappeared.

As far as I know, none of the drives have disappeared from BIOS, only Windows 7. If I go into Disk Management the HDDs don't appear until I scan for hardware changes after which windows finds the missing HDDs again. The HDDs also reappear after a restart.

I really have no idea what's happening with this and would love any solution to this problem.

System Specs:
Windows 7
MOBO: Intel B75
CPU: i7-3770K
Graphics: Radeon HD 7750 2GB
RAM: 16GB DDR3 1333
Power: 700W
Storage: 128GB SDD, 1TB WD Black, 2TB SG 7200rpm
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More about mystery disappearing reappearing hdds
  1. Had issues of my RAID disappearing about 8 months ago. Put in new SATA cables and problem solved. Try that as well.
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