if i can be of any help to get to the bottom of this gimme a yell
system specs, dxdiag or whatever i can do, motherboard in this pc has issues and is older but its had no issues with sata drives as far as i can tell (x79 platform)
EDIT: got my pool working again, i did not have the drives mounted into C: before today, it ran with the drives letter-less for years without issue
simply followed the recommended setup with them mounted into C:/drivepool/wd2/ etc.. working good now and with letters removed again