They made the tray on the A07XL HUGE! Basically, the tray is the entire width of the drive. This caused some grief after the install on my Dimension 4600. After powering on, I discovered that the tray would NOT OPEN because it was hitting both the top and sides of the front panel.

Sooooo, after the (less than) 5 minute install, I spent about an hour carving and filing out the opening on the front panel of my Dimension in order for the tray to clear.

Anyway, I LOVE the drive.......ultra-quiet and F A S T! BUT watch out Dimension owners! Don't install this drive in the top slot and don't be surprised if you have to widen the opening on the front panel.