FIG. 1 is a front elevational view of a data storage unit showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a front perspective view thereof shown with the cover opened and a cartridge inserted therein; and,

FIG. 5 is a front perspective view thereof shown with the cover opened and a cartridge removed.

The cartridge in FIGS. 4 and 5 is shown in broken lines for illustrative purposes only and forms no part of the claimed design.