Undo RAID 0 and move OS to one HD

Hi edokie and welcome to Windows 7 Forums

Since the data in a RAID0 volume is split and interleaved between 2 or more HDDs, you will have to reinstall if you want to do what you are thinking. You are correct in saying that you need to change BIOS settings, however reformatting the drives is optional. The OS drive will be formatted during the installation process, and you can optionally format the other drive either at the same time or from within Windows itself.

However, have you considered using a smaller drive e.g. a 250GB one for your OS and still leaving the other drives in a RAID0 configuration for your data (you will, of course, need to erase their contents)? This will give you the best results, as I think the problem stems not from having your system set up as RAID0 but doing video editing on files that exist on the same disk as your OS and paging file. With audio, this is possible due to the lower data rate, but with video and its higher data rate it is very noticeable if there is a lot of paging activity.

Either way, you will need a clean reinstallation of the OS.

Hello edokie, welcome to Seven Forums!

If you want to do away with the RAID, after you have copied out or made back-ups of the data you need to save to external media.

First power down the PC to disconnect all HDDs but one from the mobo and leave that connected to the #1 SATA port on the mobo and set it as the second boot device after the CD/DVD drive; then set the motherboard from RAID to AHCI in the BIOS.

Next boot the Windows 7 DVD and use Step One of this tutorial at the link below to do a wipe (secure erase) to the entire Hard Disk Drive, running this then using the outline in Step Two #2 to create/format and mark Active a single 100GB partition using diskpart will get you the best possible space to clean install Windows 7 to.

After the install, if you want to extend the Windows partition to the whole 1TB you can.

SSD / HDD : Optimize for Windows Reinstallation

DISKPART : At PC Startup


Then when Windows 7 is booting good, power down the PC and reconnect the other HDD and restart Windows; have a look at this tutorial at the link below, you'll want to do the clean all listed in step #7 from an elevated command window to the other HDD to wipe it also.

Disk - Clean and Clean All with Diskpart Command


Be sure to post back with any further questions you may have and to keep us informed.

Welcome Edoki.

I concur with Dwarf : since you will need to break the RAID array in the BIOS, in addition to setting the controller to either AHCI or IDE, you will have to reinstall the OS, the program files, and copy your data back from the external storage. In addition to Dwarf's suggestion about keeping the data on the existing RAID0 (you will miss the speed!), you might consider, budget allowing of course, to install a SSD and have the OS and program files on that. This will address your concerns, and also give you a very significant boost in terms of program loading and access.

If, however, you want to follow your original plan of action, then following BFK's posted advice is the best way to go about it.

Don't forget to backup all your data externally before starting!

Good luck,
Golden