Right-click the name of the drive (on the left side where it says "Disk 1") or the volume bar on the right. Select Eject . Note: This forces Windows to release any handles it has on the drive.

If the drive remains locked, use the Windows tool to wipe it clean before trying again in TransMac.

: If you have the DMG or ISO file currently mounted as a virtual drive in Windows, right-click the virtual drive in File Explorer and select Advanced Solution: Diskpart Clean If the drive remains locked, use the Windows utility to force-clear any existing partitions and locks. Warning: This will erase all data on the USB drive. Start Menu , right-click it, and select Run as administrator and press Enter.

Then reopen TransMac – the lock should be gone.

: Use the Windows Task Manager to end any processes that might be accessing the drive, such as active file transfers or other disk utilities.