Disk drive mounting device for a portable computer

1. Field of the Invention A drawer-type mounting device is adapted to mount a disk drive in a computer housing. The mounting device includes a lower case, an upper case, and a pulling member. The lower case has a first base plate with a first front end and a notch that extends rearwardly from the first front end. The upper case has a second base plate disposed slidably on the first base plate. The second base plate has a trench part which projects downward into the notch. The trench part has a guide rail unit that extends along a direction parallel to a line extending rearwardly from the first front end. The pulling member is mounted slidably in the trench part, and is guided by the guide rail unit for movement relative to the second base plate so as to move the upper case relative to the lower case.