Disk drive unit having a loading mechanism

A disk drive unit having a disk loading mechanism, for use in a mobile device. The loading mechanism is arranged for receiving a disk (A) through an opening in a housing of the device and bringing it into engagement with the disk drive, and vice versa. It comprises a tray ( 8 ) which is movable with respect to the housing and the disk drive between a first position for receiving a disk and a second position covering the opening and allowing the disk drive to engage the disk. The tray is rotatable about an axis ( 10 ) which substantially coincides with the drive axis ( 11 ) when in its driving position. This arrangement results in a slot loader having a tray which will hardly project outside the housing, resulting in a robust loading mechanism.