Sun 411 with scsi harddisk (size unknow) ,not tested 411 - Desktop disk pack - 24.5cmx26.5cmx7.5cm hi (internal latches) The 411 could hold a SINGLE 3.5inch device (like a HD), or a single 5.25 inch "half height" device, such as a CDROM. However, its the most common of the Sun cases. QUESTION How do you open a Sun 411 style case? ANSWER On the sides near the rear, take a small tool like an ice pick, #0 screwdriver etc. insert into the second hole from the rear of the box, on the second row of holes from the top, you should hear it click when it releases. do this for both sides. Viola!! open 411 box. Other tools you can use to try and open the internal latches are: a paper clip a coffee stirrer a pin punch Be careful not to push too hard, though Sun engineers these things well, the little plastic latches will BREAK if you press on them with too much force. From the back and top of the unit, count three holes forward. Push something (a pencil works, or small screwdriver) through the hole in the second row from the top. (It's offset to the back if I remember correctly.) Do not apply too much pressure. It only has to move inside about an eighth of an inch. The top then sort of rotates forward. (There are some plastic flanges in the front bottom edge of the case which will be the center of the rotation. You may want to locate these first.) While the case looks sturdy enough, the plastic walls and rear fasteners can be broken with too much force. I have actually used a plastic coffee stirrer to open a 411.