D Drive randomly dismounting.

Hi there, i have been running into an issue where my D drive will randomly dismount itself.

The very first time happened when i was playing Left 4 Dead while downloading a new update for steam in the background. All of a sudden steam locked up and my drive was no longer detected. It happened a second time when i went to load up another game while downloading patches through the steam client. Game locks, steam crashes, drives dismounts.
But this time it just happened out of nowhere. I was playing WoW which is on my C: drive and Steam came up and crashed. It was just running in the background and i didn't see that it was downloading anything. I have run a chkdsk on all my drives and nothing is coming up. Not sure what to do at this point but the only thing on that drive is Steam and games that i have downloaded . Event viewer is just spammed with:

An error was detected on device \Device\Harddisk1\DR1 during a paging operation.

With one or two:
The system failed to flush data to the transaction log. Corruption may occur.

I was able to continue to do everything that was on the C: drive with no problems whatsoever just the D drive wasn't being recognized.
Is the drive potentially dying?

Sure, it is an internal hitachi 1tb 7200 rpm. I just reformatted and reinstalled windows and tried it out with a game on the D drive and it went down again. Dismounted the drive and locked the game. Was able to task manager out the first time. Updated my bios after that. This time i tried again and it pretty much just hardlocked the drive or something. use ctrl+alt+del to override and get to task manager but it locked up explorer and it couldnt do anything after that. Had to hard reboot.

I ran that calc and it said i needed about 520 watts total. My power supply is a xtremegear 800w. I have heard some pretty bad stuff about them so maybe that could be a problem. I had this happen a couple of months back but was able to game pretty fine and the problem only appeared once more.
Now anytime i try to play a game or get it to load a game up it will immediately dismount and sometimes just continually crash explorer. I thought it might be a busted registry and the reformatting would fix it but it seems that isnt the case. I have run multiple scans of chkdsk, smart scans, hd diagnostics and it never comes up with anything.

Would the drive dismounting itself also cause explorer to just crash? Before i formatted both drives when i booted up steam (which is on the d drive) explorer just crashed and restarted itself about 6 times before i was able to open up task manager and end the steam process. Then it stopped crashing. Im completely confused why the D drive dismounting would cause my C: drive running windows (corsair 128gb ssd) to have problems.


EDIT: I also remembered that one of the times it dismounted was when steam was just sitting in the background. I was playing a game that was installed on my C when i saw that steam crashed. When i looked at windows explorer it didnt list my D drive. I was able to do everything pretty much fine that involved my c drive and nothing seemed to interfere. After that when i tried to load a game up is when the explorer crashes began and i decided to do the reformatting.

I'm going to try to rewire everything once i feel a bit more up to it. It really seems to only have a problem when the drive needs some extra juice to have something written to it or for it to be read by booting up a game. I haven't had any problems with my C drive and gaming though so once i get the chance i will see what i can do.

Is there anything else i can do to see if there are problems with the HD other than the diagnostics i have run? I dont have anything on there but steam and darksiders 2. Everytime it tries to load the game, it gets to the intro sequence then locks up and dismounts. Everything is on a fresh install of windows 7 x64 and both drives were formatted.