We claim the ornamental design for a USB memory drive, as shown and described.
FIG. 1 is a perspective view of a USB memory drive in accordance with the present design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a right side view thereof; and,
FIG. 7 is a left side view thereof.
The broken line showings of the USB connector and the subsurface engraving are included for the purpose of illustrating portions of the USB memory drive and form no part of the claimed design.