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I want to use RAID 1 on my workstation configuration at work, and I've been looking at using the build in mirror functionality in Windows 7. When you click on the add mirror option it presents you with the following warning.

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I've done some Google searching and the consensus seems to be that you cannot boot from a dynamic volume, but some forum posts seem to indicate that people have tried this with success (e.g. here).

With Google searches producing contradictory information I thought I'd ask you guys for an authoritative answer. Can I use the inbuilt Windows 7 mirroring for my boot partition? Or as I suspect, will it make it unbootable due to it being converted to a dynamic disk?

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It is not supported by Microsoft. Whether it's possible is less important than whether it's sensible. I'd look at hardware RAID, and many boards already come with controllers, though you could buy one for cheap that supports SATA drives now. –  user3463 Jun 18 '12 at 17:34
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