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Monday, December 21, 2009

Stop 0x000000ED or UNMOUNTABLE_BOOT_VOLUME

The kernel mode I/O subsystem attempted to mount the boot volume and it failed. This error might also occur during an upgrade to Windows XP Professional on systems that use higher throughput ATA disks or controllers with incorrect cabling. In some cases, your system might appear to work normally after you restart.

Possible Resolutions:

• If using higher throughput ATA disks and controllers, those capable of data transfer rates above 33.3 megabytes per second, replace the standard 40-pin cable with an 80-pin cable. Using an 80-pin cable is optional for transfer rates up to and including 33.3 megabytes per second, but is mandatory for higher transfer rates. The additional grounded pins are required to avoid data loss.

• Some firmware enables you to force higher transfer rates even when you are using the incorrect cable type. Your firmware might issue a warning but allow the startup process to proceed. Restore the default firmware setting for ATA cable detection.

• Problems that cause 0xED errors might also cause Stop 0x7B errors. For more information about 0x7B Stop messages, see "Stop 0x0000007B or INACCESSIBLE_BOOT_DEVICE" earlier in this appendix.

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