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Windows 7: Windows Partition Unmounted Itself, BSOD on Boot

25 Oct 2013   #1
Laraso

Windows 7 Home Premium 64bit
 
 
Windows Partition Unmounted Itself, BSOD on Boot

One night, I shut down my computer to install Windows Updates overnight. When I tried to start Windows the next morning, I got a BSOD when attempting to boot. As soon as the "Starting Windows" logo appears, I immediately get thrown into a BSOD, which hardly lists any information even for BSOD standards.

The ONLY thing it says is "If this your first time encountering this problem,... " and this STOP code:
0x0000007B (0xFFFFF880009A9928 0xFFFFFFFFC0000034 0x000000000000000 0x000000000000000)

Thinking it might be a hardware issue, I ran a hardware diagnostics test. The test reported that my hard drive had failed, but I didn't believe it since at least a small portion of Windows was being loaded off of the HD. I then attempted to boot into safe mode (I probably should have done that before I tried the hardware test lol), but after the driver CLASSPNP.SYS gets loaded, it crashes and throws me the same BSOD as before.

Booting into Windows Recovery Mode "works", but when it asks me which operating system I wish to load, the box is completely empty. Windows 7 is not listed at all. I figured the recovery partition might have somehow become corrupted, so I tried booting into recovery mode via my installation CD, but just like before, no operating systems are listed and therefore everything in the recovery console is completely useless.

I then pulled out an old Ubuntu installation disc of mine, and booted into Ubuntu from the CD. Sure enough, the drive was working just fine and I can access ALL of the data on the hard drive through Ubuntu. I ordered a new HD of the same speed and capacity, which arrived just a few minutes ago, and I'm backing up all of the data I want to keep to an external drive, just incase the hard drive really DOES fail and/or I'm forced to reinstall Windows.

I really don't want to reinstall Windows if I don't have to. If I can, I want to repair my Windows installlation, so I can boot into Windows and create a system image to transfer my Windows installation to the new HD.

Does anyone have any idea what could be causing this, and is there any way to fix this without completely reinstalling windows? My PC is a Dell Studio XPS 9100, running a 64-bit installation of Windows.


My System SpecsSystem Spec
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26 Oct 2013   #2
Laraso

Windows 7 Home Premium 64bit
 
 

Bump... The thread got buried.
My System SpecsSystem Spec
26 Oct 2013   #3
Golden
Microsoft MVP

Windows 7 Ult. x64
 
 

Have you tried a repair install?

Repair Install
My System SpecsSystem Spec
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26 Oct 2013   #4
Anshad Edavana

Windows 7 Ultimate x64
 
 

Hi

BSOD 0x07B is always related to hard disk. What this bug check is telling us is that, there is a problem accessing the boot device.

Bug Check 0x7B: INACCESSIBLE_BOOT_DEVICE (Windows Debuggers)

Since you already did hardware diagnostic and the disk is failed, definitely the hard drive is in trouble. What you can do now is to run manufacturer's diagnostic tool and let it to fix repairable issues. Please visit the below link which includes links and instructions to run disk diagnostics of all major manufacturer's.

Hard Drive Diagnostic Procedure
My System SpecsSystem Spec
26 Oct 2013   #5
Arc

Microsoft Community Contributor Award Recipient

Microsoft Windows 10 Pro Insider Preview 64-bit
 
 

Quote   Quote: Originally Posted by Anshad Edavana View Post
Hi

BSOD 0x07B is always related to hard disk. What this bug check is telling us is that, there is a problem accessing the boot device.

Bug Check 0x7B: INACCESSIBLE_BOOT_DEVICE (Windows Debuggers)

Since you already did hardware diagnostic and the disk is failed, definitely the hard drive is in trouble. What you can do now is to run manufacturer's diagnostic tool and let it to fix repairable issues. Please visit the below link which includes links and instructions to run disk diagnostics of all major manufacturer's.

Hard Drive Diagnostic Procedure
Very well said, but it is not always related to hard disk. Though Hard Disk is one of the most frequent causes.

We have noticed two significant other causes of a stop ox7B; those are ....
  • Boot sequence error
  • Bootkit (MBR Virus)
So, I want to add one thing with your excellent suggestion ....
Troubleshooting Windows 7 Failure to Start

It takes care of both of the causes those I mentioned.
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 Windows Partition Unmounted Itself, BSOD on Boot




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