JSI Tip 4788. Why doesn't Windows NT / Windows 2000 boot from a shadow mirror drive?

Microsoft Knowledge Base Article 167045 contains the following summary:

Microsoft Windows NT supports Disk Mirroring and Disk Duplexing of the operating system partition. This article is intended to help clarify why the shadow drive does not always boot and how to ensure that it will boot in the case of a primary disk failure. The most common symptom when trying to boot from the shadow drive is that the system will hang after POST with a blinking cursor and no boot menu options are displayed.

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