FIG. 1 is a first perspective view of a USB flash disk, showing my design.
FIG. 2 is a second perspective view of the USB flash disk.
FIG. 3 is a front elevation view of the USB flash disk.
FIG. 4 is a rear elevation view of the USB flash disk.
FIG. 5 is a left side elevation view of the USB flash disk.
FIG. 6 is a right side elevation view of the USB flash disk.
FIG. 7 is a top plan view of the USB flash disk.
FIG. 8 is a bottom plan view of the USB flash disk; and,
FIG. 9 is a perspective view of the USB flash disk, but shown in an alternate position.
The broken lines shown in the drawings represent portions of the USB flash disk that form no part of the claimed design.