I have to hard drives on my computer one is fr 300 GB n the other is for 500 GB and both were been detected never had problem in last 8 mnths , but for last 3 days my computer does not detect the 500GB hard drive. Aticipating fr your response.
More aboutunable view drive computer
Did the computer suffer any shocks, BIOS meddling or anything out of normal use ? If still under warranty, I'd have the mfg. repair shop look it over, they can open it without invalidating warranty and check loose wires.
do you have a restore point before that happens, i would try this
Need more info on your PC setup and latest changes.