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RAID 1+0 to RAID 5

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I need advice for best strategy for what I want to do. Present setup:
C: (boot drive) 128GB SSD (Windows 7 Pro x64)
D: 4x320GB in a RAID 1+0 configuration (seen as 640 GB Drive)
The RAID controller is Intel on the motherboard.

The C drive has the OS and some programs. The D Drive contains both data and programs.

I do "Disk Backups" of both the C and D drives.

I would like to replace the RAID 1+0 array with a RAID 5 array using larger drives. Probably 3x500GB initially which would result in a 1TB drive.

I believe the Intel controller will only support a single RAID array.

Can I just remove the "D Drive" (the four drive array); replace it with the three new drives; set up the RAID in the motherboard to be RAID 5; boot from the Acronis rescue disk; and restore the D drive backup to the new, RAID 5 D drive? Or is the process more complicated?

Thanks.

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You should be fine. A long as the RAID is presented to the OS as a single drive, the backup and restore should work exactly as you have described.
Be sure to note your settings in your system BIOS/UEFI and RAID firmware for the current RAID setup, in case your results don't work out the first time, and you need to go back to the original configuration for troubleshooting.