: Type list disk . Look for the disk number that matches your USB size (e.g., Disk 1 or Disk 2).
If you have the drive's folder open in Windows Explorer, the OS maintains a handle on the device. Disk Management Utilities: Transmac Drive Has Been Locked By Another Program
Type clean and press . Warning: This erases all data on the USB. : Type list disk
Right-click any process using that drive and select . Alternative if TransMac Still Fails Disk Management Utilities: Type clean and press
This typically occurs because Windows or a background security application is actively monitoring or protecting the removable media, preventing TransMac from gaining the exclusive low-level access it needs to format or write to the drive. Common Causes of the Lock Security Software Interference
This error appears when you try to perform an operation (like restoring a DMG, formatting a drive, or writing an image) and Transmac informs you that it cannot access the drive because some other software on your Windows PC has an exclusive lock on it.
If using a trial version, ensure it hasn't expired, as this can sometimes trigger generic access errors. alternative programs