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I had 2 unpartitioned blank disks in my machine before installing Win7.

I manually created 2 partitions on first disk and selected first partition for Windows installation.

Now I have discovered that Windows has put the 100mb recovery partition on the second disk.

I intended to use the disk 2 for mirroring. What shall I do with the recovery partition?

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Well is it making problems for you?? Win7 needs that for restoring files if needed – poqdavid Jun 25 '13 at 13:39
The problem is he wants that entire drive to mirror the system most likely for a backup. – user88311 Jun 25 '13 at 14:39
up vote 2 down vote accepted

Format the second disk, and recreate the recovery partition on the first one, then you can use the second disk for backup/mirror.

You may want to disconnect the second one before recreating it though, just to make sure windows doesn't decide to put it on it again.

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