http://support.microsoft.com/kb/297185

CAUSE
This behavior can occur if either of the following conditions is true:

• Your computer uses an Ultra Direct Memory Access (UDMA) hard disk controller, and the following conditions are true:

• You use a standard 40-wire connector cable to connect the UDMA drive to the controller instead of the required 80-wire, 40-pin cable.

• The basic input/output system (BIOS) settings are configured to force the faster UDMA modes.

• The file system is damaged and cannot be mounted.

It could be either. Personally i've seen so many notebook drives fail its not funny. Just make sure you keep regular backups for a bit and see if you have any other problems.

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Osama Bin Hooning
Senior Terrorist Operative
Perth-Wrx

yeh ill be keeping much more regular updates. thanks guys..

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I'm a jockey kunts...

wierd co-incidence, my laptop yesterday BSOD with the same unmountable_boot_volume haha.. i made a BartPE iso and booted from it, ran diskchk and it fixed the bad sectors and mbr so its fixed.. keen2backup!

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MY02 WRX STi - sold :(
'12 Golf GTI

n00b