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unmountable disk volume

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Ok here is my strange issue. I have a toshiba satellite laptop.. windows 7 64 bit. Satellite L655D-S5066
So the issue is i power it on, then it goes to the screen which says windows failed to strt. A recent hardward or software change might be the cause... blah blah. So i choose launch repair.. it launches the files, then all i get is a black screen with the mouse cursor, and nothing else...If i choose start windows normally, i get the starting windows image(stays here for about 1 minute then reboots)...i try safe mode with command prompot.. it loads the windows files, stays on the screen for about 30 seconds, then restarts
I went into debugging mode.. it starts up windows, with the same starting windows image.. sits there for about 1 minute then restarts..
so then i chose the option which disabled automatic restart..
so then i got the error message.. unmountable_boot_volume..
so then i made a 64 bit windows 7 recovery disk and tried to use it..
i was able to boot from the cd.. it said loading files as usual, then again, went to the black screen with the mouse cursor..
any suggestions??

I am guessing its somethign to do with the Hard drive... do i have to try to run a diagnostic on the Hard drive?

So I found out the type of harddrive that is within in the laptop and I found out that toshiba does not make any diagnostic tools for it.
So now I am back to square one or can I use another type of diagnostic tool??


Edited by mrq201, 11 December 2010 - 04:41 PM.

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You can use "Seagate SeaTools for DOS" to test any brand of drive generically:

Using a working PC, burn the ISO file to a CD using 'Nero' or similar burning software which can burn ISO files to a disc.
The resulting CD will be bootable. Boot your Toshiba laptop from that CD to test the drive.
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