Question about Western Digital My Book Essential Edition (WDG1U5000N) 500 GB Hard Drive
Hi. In order to resolve this issue. Boot in to your CDROM drive while the operating system disk is in there then run the recovery console. This will put the Mup.sys file back to your computer. Possible cause of this is corrupted mup.sys file which is essential in booting the harddrive. Another troubleshooting is, since you took out the harddrive and put it in your enclosure look for computer with the same operating system and copy its mup.sys file into your harddrive. This file is located at C:\Windows\System32\drivers. That will do the trick.
Posted on May 31, 2010
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Posted on Jan 02, 2017
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