Adaptec, Adaptec RAID 6805E, Microsemi. The Adaptec Embedded Serial ATA Controller work. X7DWU User's Manual Configuring the Adaptec SATA RAID for Operating Systems -Windows, Red Hat & SuSe, Linux 1. Boot discs didn't always recognise newer raid arrays, need to use a Windows PE boot disc for those.
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Depending on the card this either means a total rebuild, or creating another mirror and telling it to stripe across the two.

1. Double-check that the card supports RAID 10
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2. Create a Backup of your data

3. Create a second Mirror

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4. Attempt to stripe these arrays through the controller.
If the options aren't available you'll need to start from scratch, since you have a good backup now, this isn't a big deal.
Depending on the controller you'll either be able to create a RAID 10 array, or you'll need to create two stripes and configure the card to mirror them (since RAID 10 is a nested level).
