The ornamental design for a usbmemorydevice, as shown and described.
FIG. 1 is a top front right perspective view of the USB memory device.
FIG. 2 is a bottom plan view of the USB memory device.
FIG. 3 is a front elevational view of the USB memory device.
FIG. 4 is a right side elevational view of the USB memory device, the left side being a mirror image of the right side.
FIG. 5 is a top plan view of the USB memory device where the handle has been pivoted from the front to the back and positioned so the USB connector extends out the front.
FIG. 6 is a right side elevational view of the USB memory device where the USB connector extends out the front; and,
FIG. 7 is a top front right perspective view of the USB memory device where the USB connector extends out the front.