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I have heard, that it should be somehow possible to use just one partition with Windows XP, and be able to mirror that by enabling RAID 1 in XP. I'd appreciate tips how to do this.

If this is true, is it also possible to enable RAID for an existing Windows installation?

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you want to mirror it ... to what? another drive? another partition on the same drive? – quack quixote Jan 20 '10 at 15:00
Nauturally I would like to mirror it to a second drive – tputkonen Jan 21 '10 at 19:02

Windows XP/2003 and later versions has mechanism called "Dynamic disks". But you can create mirrored drives only in 2003 server and XP Pro.

More information about dynamic disks here

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XP Pro doesn't support creating mirrored dynamic disks. However, I think that if one had a mirror set up in advance (with, say, 2003 Server), XP could be installed onto it. – afrazier Nov 12 '11 at 23:31
I have a mirrored volume in XP pro. Want a screenshot? It's mirrored with Disk Management – Canadian Luke Nov 13 '11 at 2:53
@Luke: I also have a mirrored volume in XP Pro. However, enabling this functionality in XP Pro requires a hack. In "normal" XP Pro it is inaccessible. – AnT Mar 11 '13 at 22:04

During the initial XP installation, at the very beginning you get a message where the installer asks you to press the F6 key to install third-party drivers. Keep yours eyes open, it doesn't wait for long. Press the button and you'll be prompted to enter a floppy disk. Your RAID controller should come with one. Just use that and follow instructions.

As for your second question I'm not sure, but you might want to look here:

Is it possible to enable RAID 1 without reinstalling Windows?

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I don't mean hardware RAID (aka one implemented with RAID in SATA adapter), but a software-only RAID included in Windows. – tputkonen Jan 21 '10 at 19:03
The button is F6, not F2 (I corrected your answer for you). – Joel Coehoorn Nov 12 '11 at 23:12

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