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Published on 02.04.10 by Brent Trahan

Troubleshooting a Stop 0xED or UNMOUNTABLE_BOOT_VOLUME

Learn how to troubleshoot the Stop 0xED or UNMOUNTABLE_BOOT_VOLUME Stop Error (BSOD) in Windows 7.

What caused the error?

The kernel-mode I/O subsystem attempted to mount the boot volume and failed.  This error can occur during an upgrade to Windows 7 on system with high-throughput ATA disks or controllers with incorrect cabling.  Sometimes a restart will fix the problem.

How do I fix it?

  • If you’re using an ATA hard drive that is capable of transfer rates higher than 33.3 MB/sec, make sure the cable is an 80-pin cable.

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