also: ユーエスビーメモリ
noun
USB flash drive; USB memory stick; thumb drive
A small portable storage device that plugs into a USB port. In Japanese, メモリー is often used instead of メモリ, but both are understood.
USBメモリーにファイルを保存した。
I saved the file to a USB flash drive.
このUSBメモリーは容量が大きい。
This USB memory stick has a large capacity.