Windows cannot mount Boot Volume

by Abhishek Bhatnagar on April 9, 2008



One of our readers, Mehraj, sent us a problem saying whenever he powers on his computer, the computer does not boot. It show error message like “Unmountable Boot Volume or STOP 0x000000ED UNMOUNTABLE_BOOT_VOLUME” message.

Unmountable boot volume

It can really trouble someone a lot if the computer refuses to boot at all. In such cases the computer even does not start even in safe mode.

The main reasons behind such problem are:

  • Incompatible BIOS settings
  • Faulty or incorrect bus-cable
  • Boot sector virus attack
  • Corrupt boot sector

Lets us see the ways to sort these problems:



Lets go one by one:

  • Incompatible BIOS settings: This can be a problem when the actual disk supports a particular DMA mode and BIOS is configured for higher settings. In such case, you can try to reset the BIOS to default settings and save changes. Restart the computer. It may fix the trouble.
  • Faulty or incorrect bus-cable: Bus cable is very important for proper functioning of drive. In case the disk is configured to use 80 pin UDMA cable and you are using a regular 40 pin DMA cable, it may cause such errors. Check your bus cable which connects hard drive to motherboard. Replace if it is faulty or of wrong type.
  • Boot sector virus / Corrupted boot sector: If your boot sector has become corrupt because of some disk problem or virus problem, in such case, you need to run a repair setup for windows.

See this post for detailed steps on how to run a repair setup for Windows XP.

Tip: Keep your virus definitions updated to prevent boot-sector virus attacks.

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{ 2 comments… read them below or add one }

vedha May 21, 2008 at 6:16 pm

i found that the problem was due to some dangerous malwares in my registry . i partly overcame this problem and now i request you to suggest a best anti malware and registry optimising softwares that are available freely

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