Check your drivers for your mother board.  I have a DFI motherboard with the
VIA chipset.
It would not recognize I had a HP CDRW installed.  I checked the drivers in
the Device Manager, especially the IDE ATA/ATAPI controllers and found the
drivers were Microsoft and not the VIA chipset drivers.  Once these were
installed (updated)the devices came right up and stayed there.

Larry Peterson

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