My hard drives shut down for no reason and on their own

[Nabukodonosor]

OK guys, here's the deal. I've been having this issue for a while now, and it occurs every couple of months. I have an SSD for my Windows 7 sistem, and 2 hard drives. And the problem happened again today. Suddenly I notice something weird, for example my Skype logs out and say it has an I/O problem (my cache folder is on my hard drive). So I go to My computer and I see that all my partitions that reside on that hard drive are gone. So I have to reset my PC to temporarely resolve the issue. But after an hour or so it happens again. If I shut down my PC I will get more time, but only few hours. So I have to open my case and disconnect that drive and reconnect it to a different Sata port. And that solves it. For a month or two. After couple of months it happens again. I've check all my hard drives with HD tune, no issues. I tried new sata cables, 5-6 of them, and that didn't help. I happened with both of my drives. In every sata slot. Any ideas?

 

[Megahertz07]

At BIOS settings under power settings, is there some option to shutdown HDD?

Go to Control Panel\All Control Panel Items\Power Options - Change plan settings - Change advanced power settings - HDD.

 

[Nabukodonosor]

Go to Control Panel\All Control Panel Items\Power Options - Change plan settings - Change advanced power settings - HDD.

This is set to NEVER.

But everything about a setting is a moo point, because the moment I switch the sata port, everything is fine for the next couple of months. So if the a setting is the problem, it would happen again on a different sata port.