Are these drives you have fitted yourself, or been added as after market drives?
If so you have run in to the odd way Toshiba set their optical drives as master or slave, although this is generally and IDE #1 error.
To fix this you need to solder pin 45 and 47 together.
47 is the key pin here, as it controls whether the drive is in SLAVE or MASTER mode.
grounded, the drive is in MASTER, open, it is in SLAVE.
pin 45 is simply a grounding pin.
So you'll need to open up the drive, turn it over, and put a small blob of solder on the two pins next to each other - 45 and 47.
If they are original drives or used to work then uninstall the drives and the IDE controllers in Device manager and reboot, letting windows redetect and install the hardware. Also try reinstalling the motherboard drivers available from Toshiba's support site.