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#121
The HD's are probably too BIG to be formattted by DOS. Would have to use FDISK possibly to create a small DOS partion, then see if it will format ? I don't think you have 2 BAD HD's.
I think gregrocker's idea of installing your HD on another computer first, then trying to install win7. If it installs, move back to your custom Biostar MB & see if it will boot.