USB Lockit for Windows - It enables you to set a pin-code protection to your USB flash drive. Once this has been done, the drive is effectively locked until the correct pin is entered. Once the drive is locked, one cannot read no write to it without the correct pin.
The fact that the software is available for Windows and Android means that it is ideal for anyone who works with PC or smartphone.
Works with all USB flash drives formatted in FAT32/exFAT.