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Resolving “Unmountable Boot Volume” Error in Windo

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Microsoft Windows hard drive contains two types of partitions- system/boot partition and data partition. The boot partition contains operating system, master boot code, and MBR (Master Boot Record), which are used to boot your system. When your system boots up, MBR is the first program that is loaded into main memory, followed by boot loader and operating system.

However, in some situations, the boot volume of your Microsoft Windows system can not mount and the system becomes totally unusable. This behavior renders all your valuable data on the Windows hard drive inaccessible and cause severe data loss. In order to retrieve lost data from hard drive, hard drive recovery applications are required.

In a practical scenario, you may come across the below error message when you try to boot your Microsoft Windows XP computer:

“STOP 0x000000ED (0xaaaaaaaa,0xbbbbbbbb,0xcccccccc,0xdddddddd) UNMOUNTABLE_BOOT_VOLUME”

In the above error message, aaaaaaaa, bbbbbbbb, cccccccc, and dddddddd are the hexadecimal numbers, which may vary as per your system configuration.

Grounds of the problem

You may come across this problem when your file system gets damaged and the boot volume can not be mounted. Most commonly, this problem is due to corruption to the Boot.ini file. Boot.ini is the main boot file of Windows XP operating system, which contains all critical boot configuration settings.


In order to work around this problem and perform Hard Drive Data Recovery, check the integrity and consistency of your Windows hard drive. You can check your hard drive for errors using inbuilt utility of Microsoft Windows operating system, known as ChkDsk. You can repair a damaged hard drive using the below steps:

Enter Microsoft Windows Recovery Console using Windows boot disk.

Type chkdsk /r at command prompt and press enter key.

When repair process completes successfully, type exit.

Reboot your system.

If the above method does not work, you need to format your Windows hard drive and reinstall Windows operating system. It replaces all the damaged files and gets your system back to working state. However, it also removes data from hard drive and creates need of Hard Drive Recovery Software. They are totally safe and easy to use. Such tools use high-end scanning techniques to methodically scan the hard drive and extract inaccessible data from it. The applications Recover Hard Drive in all cases of data loss.

Stellar Phoenix Windows Data Recovery software recovers lost data from hard drives, USB drives, memory cards, and other storage media. The software works well with Microsoft Windows 7, Vista, 2003, XP, and 2000. It salvages data from NTFS5, NTFS, FAT32, VFAT, FAT16, and FAT12 file system partitions.

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