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Windows 7: System Improperly shut down, UNMOUNTABLE_DISK_VOLUME BSOD

20 Jan 2013   #1
E3245

Windows 7 Home Premium 64bit
 
 
System Improperly shut down, UNMOUNTABLE_DISK_VOLUME BSOD

Hi, I am new here
D
This BSOD error "UNMOUNTABLE_BOOT_VOLUME" started today, after our Acer Aspire M3470G was shut down improperly after the system froze. The last thing I was doing was playing Minecraft before it locked up. I booted into System Recovery, but the Windows 7 OS wasn't listed, so I skipped the OS check and I tried Startup Repair.

It finished in seconds and the result was that MBR was corrupt, so I opened the Command Prompt and typed in bootrec /fixmbr but it doesn't detect the C: Drive, even if I try cd C: it returns as "the device is not ready".

I tried DISKPART>select disk 0>list partition but there is no partitions shown.

I tried sfc /scannow but it says that it needs to be rebooted to complete, but I can't really do that.

I don't have a Recovery Disk, so that can't help me.

Can someone help me with this?

My specs are
AMD Quad-Core A6-3620
ATI Radeon HD6530
500GB SATA HD
PIONEER CD/DVD drive
(both HD and DVD drives are on RAID controller)


My System SpecsSystem Spec
.
20 Jan 2013   #2
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

diskpart->sel disk 0 did you find the disk as far I can conclude from your post. MBR was coorupt. MBR consists of:
  • Master Boot Code. Basic code that looks foor ACTIVE partition and boots from that partition. Bootrec/fixmbr did refresh that
  • Disk signature. Hope it's still the same as it was. We don't know what was really corrupt. Not a real problem hower
  • Partition table. This table is coorupt. It can't find any partition
I don't know what did corrupt it and what on disk is corrupt. I hope data is still intact


Download and burn Partition Wizard. Free download Magic Partition Manager Software, partition magic alternative, free partition magic, partition magic Windows 7 and server partition software - Partition Wizard Online (take the last on bootable CD). Boot from it.

Do this http://www.partitionwizard.com/video-help/rebuildmbr/rebuildmbr.html

and this
Select full disk, quick scan. Ignore small fake partitions size about 3MB. Does it find the partitions? Recovery them.


Do How to activate Partition Recovery Wizard of partition magic? Partition Wizard Partition Recovery Wizard Video Help.


Make the boot partition PRIMARY. After that make boot partition ACTIVE
Video help on how to set partition as Primary or Logical.
How to Set Active/Inactive partition with partition magic? Partition Wizard Video Help.

Tell me where you get stuck
My System SpecsSystem Spec
20 Jan 2013   #3
E3245

Windows 7 Home Premium 64bit
 
 

Can I use a USB flash disk instead of burning on a disk? My laptop's CD/DVD drive is not working and I would like to use a USB flash disk.
My System SpecsSystem Spec
.

20 Jan 2013   #4
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

My System SpecsSystem Spec
22 Jan 2013   #5
E3245

Windows 7 Home Premium 64bit
 
 

After making the boot partition active and rebuilding MBR, I rebooted and it now says:

BOOTMGR is missing
Press Ctrl+Alt+Del to restart.
My System SpecsSystem Spec
22 Jan 2013   #6
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

Quote   Quote: Originally Posted by E3245 View Post
After making the boot partition active and rebuilding MBR, I rebooted and it now says:

BOOTMGR is missing
Press Ctrl+Alt+Del to restart.
So you were able to recover all partitions?


Please post screenshot/camshot. If not possible... tell me
  • sizes of partitions
  • All NTFS?
  • which are primary, which are logical?
  • Which is active?
My System SpecsSystem Spec
22 Jan 2013   #7
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

Quote   Quote: Originally Posted by E3245 View Post
Can I use a USB flash disk instead of burning on a disk? My laptop's CD/DVD drive is not working and I would like to use a USB flash disk.
How did you do diskpart command without a harddisk and without CD/DVD? Did it form bootable USB?
My System SpecsSystem Spec
22 Jan 2013   #8
E3245

Windows 7 Home Premium 64bit
 
 

Quote   Quote: Originally Posted by Kaktussoft View Post
Quote   Quote: Originally Posted by E3245 View Post
Can I use a USB flash disk instead of burning on a disk? My laptop's CD/DVD drive is not working and I would like to use a USB flash disk.
How did you do diskpart command without a harddisk and without CD/DVD? Did it form bootable USB?
I pressed F8>Repair your computer. It did not find an OS so I click next. Opened command prompt and typed Diskpart. The problem is on my desktop, my laptop is working fine.

About the partitions. This is strange because it says that my Acer partition (main partition that Windows is in) is 100% full, which is not. I only used 1/4 of it. All NTFS. All partitions are primary (because the rest are recovery partitions) and the Acer partition is active.
My System SpecsSystem Spec
22 Jan 2013   #9
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

Quote   Quote: Originally Posted by E3245 View Post
Quote   Quote: Originally Posted by Kaktussoft View Post
Quote   Quote: Originally Posted by E3245 View Post
Can I use a USB flash disk instead of burning on a disk? My laptop's CD/DVD drive is not working and I would like to use a USB flash disk.
How did you do diskpart command without a harddisk and without CD/DVD? Did it form bootable USB?
I pressed F8>Repair your computer. It did not find an OS so I click next. Opened command prompt and typed Diskpart. The problem is on my desktop, my laptop is working fine.
totally confused.... I thought your drive does have no partitions at all?! F8 starts win7 recovery environment from harddisk.
My System SpecsSystem Spec
22 Jan 2013   #10
E3245

Windows 7 Home Premium 64bit
 
 

Quote   Quote: Originally Posted by Kaktussoft View Post
Quote   Quote: Originally Posted by E3245 View Post
Quote   Quote: Originally Posted by Kaktussoft View Post
How did you do diskpart command without a harddisk and without CD/DVD? Did it form bootable USB?
I pressed F8>Repair your computer. It did not find an OS so I click next. Opened command prompt and typed Diskpart. The problem is on my desktop, my laptop is working fine.
totally confused.... I thought your drive does have no partitions at all?! F8 starts win7 recovery environment from harddisk.
Ok, let me clarify.

The drive did have partitions until MBR was corrupt. When I went to win7 recovery environment from the hard disk, opened command prompt, typed diskpart>list disk, The disk (disk 0) shows up, so I selected the disk and typed list partitions, the partitions do not show up or it says "There are no partitions that can be shown".
My System SpecsSystem Spec
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 System Improperly shut down, UNMOUNTABLE_DISK_VOLUME BSOD




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