Type list disk and press Enter. Identify your USB drive number (e.g., Disk 2) by size.
: Often recommended as a modern alternative with a more intuitive interface. BalenaEtcher
Ensure no disk-burning or imaging software (like Rufus or BalenaEtcher) is running in the background. Alternative Solutions Transmac Drive Has Been Locked By Another Program
If using a trial version, ensure it hasn't expired, as this can sometimes trigger generic access errors. alternative programs
Security suites may lock USB drives upon insertion to scan them. Type list disk and press Enter
If you have access to a working Mac, plug the USB drive in and use Disk Utility to erase it, ensuring the format is MS-DOS (FAT) or ExFAT with a GUID Partition Map . Summary Table: Troubleshooting Steps Run as Admin Grant elevated permissions. Close Explorer Release file-level locks. Diskpart Clean Remove partition locks. Disable AV Stop scanning locks.
Right-click the process locking that drive and select . 5. Disable Antivirus Temporarily If you have access to a working Mac,
Before diving into the fixes, it helps to understand what is happening behind the scenes. TransMac requires to your USB hardware to write the Mac-compatible DMG file system. It cannot share the drive. The error triggers when any of the following Windows features are interacting with the USB: Windows Explorer holding open a directory view. Disk Management actively updating the partition tables.
Right-click the TransMac icon on your desktop or Start Menu. Select . Try the operation again. 2. Close Windows Explorer and Other Programs