I decided to add a new Maxtor ATA/133 160GB with 8MB cache drive to the enclosure. The whole hardware install needed only one tool, a #2 Phillips screwdriver. One screw in the bottom of each of the two feet hold the enclosure together... The space for the drive is tight and made to have six screws holding the hard drive, which are included. I connected the drive, screwed it in and closed up the enclosure for use. This is a very sturdy feeling enclosure for its simple design.