I purchased this 9020 tower to replace a dead 9010 tower with two large capacity 3.5" disks.  I checked out the system when it got here and it worked as delivered.  However when I went to open the case to add my drives, the latch could not make the slide disengage the cover.  Raising the latch did nothing.  I eventually got the case open by bending the heck out of the side panel.  I replaced it with the side panel from my old 9010, which worked just fine.  My server is now rebuilt and running.