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Drive Letters A: through E: have always been used by the PC as "local drives" reserved for floppies, hard drives, optical drives, etc.
Network drive mappings have always traditionally begun at drive letter F:.
Though additional local drives would use letters beyond the A: through E:, network drives should not use letters below F:.
Since your C: and D: are in use, the USB Flash drive seizes the next available local drive, E:, despite the fact that you have chosen to map it to a network drive.
Even your available network drive letters beginning at F: are at risk if you have enough local devices (internal card reader drives with four slots will grab the first four available letters after all of the other local drives).
This is undoubtedly why Microsoft has recommended that network drives be mapped from letter Z: backwards.
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