Bootable USB Test allows you to check before you boot up whether or not the USB drive functions correctly.

This tool is intended to come into play before booting from the USB and computer restart allowing you to check that everything is in working order.

Bootable USB Test is easy to use and requires no installation. It will enable you to check a target USB drive without going through two (sometimes lengthy) system restarts. It will create a virtual PC environment and boot up the USB drive for testing - simultaneously locking the drive from Windows to avoid any overwrites from outside the simulation. It then redirects all writes to the USB inside the sim to a temporary file (creates a snapshot at simulation start) and creates a temporary virtual hard drive for compatibility and better real-time PC simulation.

Bootable USB Test will also:

Compress the virtual HDD to reduce its size almost to 0 and speed up creation time

Work both with flash and HDD drives connected by USB/SATA/IDE/SCSI/etc.

Find an installed copy of QEMU on your PC and use it instead of an internal one