ICY DOCK's compact version of the MB123SK-1 internal 3.5" (8.9cm) SATA removable frame is an optimal solution for your storage needs: Since it has a removable hard drive tray, you enjoy far more flexibility; and the key lock effectively prevents unauthorized persons from stealing it. In addition to its convincing performance, the MB123SK-1 also ensures better system stability: thanks to its aluminum housing and additional fan, it reliably keeps your hard drive cool. The compact version can also be used in systems where only a small installation depth can be used.- Drive compatibility: 1 x 3.5 inch SATA I or II, hot swap capable- Enclosure compatibility: 1 x 5.25" (13.3cm) drive bay- More secure than fixed drives, for easy expansion and maintenance purposes- Attractive front panel with aluminum heat sink- Rear 40mm fan- Key lock secures the drive against removal by unauthorized persons-.