I assume you can physically see the drive. I'd guess it's in a tray, and the tray affixed with maybe 3 or 4 screws. Sometimes the minature IDX drive connector is permanently affixed to the case or motherboard, other times it's loose or can be unscrewed. The wires or ribbon cable are extremely fragile, so great care is needed when dealing with this connection. Determine if you can ease off this connector before undoing the drive tray screws, or if the connector is permanently affixed. If the connector is fixed and cannot be unscrewed, then the drive will have to be slid horizontally roughly an eighth of an inch so it disengages with the minature IDX connector before you can lift it out. I found on the Toshiba 1700 that I could disengage the IDX connector before undoing the drive tray screws. But I found the tray was literally stuck quite firmly to part of the case structure, and only gentle levering upwards would release it.
That's as much as I can tell you...
ROGER - G0AOZ.