If you are trying to burn a macOS DMG file to create a bootable installer, try balenaEtcher . It is a free, open-source alternative that handles drive locks differently and often succeeds where TransMac fails. To help troubleshoot this further, please share: The version of Windows you are currently running
By understanding what causes this error and following these systematic troubleshooting steps, you can quickly resolve the issue and get back to managing your Mac drives from Windows.
Once the drive shows as "Unallocated," close Disk Management and try TransMac again. 6. Use Diskpart to Clear the Drive (Advanced) transmac drive has been locked by another program hot
If the drive is "locked" because it has an existing partition or file system Windows doesn't like, you can force it to reset using the command line.
If TransMac continues to fail, you may need a different tool. UUByte is a reputable alternative that is sometimes more effective at handling locked drives during macOS DMG creation. Summary Checklist Potential Result Run as Administrator Fixes permission issues Disable Defender Removes antivirus locks Use diskpart clean Removes partition locks Change USB Port Resolves driver conflicts If you are trying to burn a macOS
Try using TransMac. You can the service again once you finish. Top Free Alternatives to TransMac
The error message is a frustrating roadblock for Windows users trying to create a bootable macOS installer or access Mac-formatted drives. This error occurs because the Windows operating system protects active drives from being modified by third-party software. Once the drive shows as "Unallocated," close Disk
To comprehend the error, one must first understand what TransMac attempts to do. When TransMac accesses a drive formatted with HFS+ or APFS, it bypasses Windows’ native file system drivers (since Windows cannot natively read these formats). Instead, TransMac requests to the volume. This means it needs a "lock" on the disk handle to ensure no other process writes data simultaneously, which could corrupt the partition map.
After executing the clean command, pull the USB drive out of the computer, wait 5 seconds, plug it back in, open TransMac as an administrator, and attempt the image restore again. Reliable TransMac Alternatives
Toggle to Off temporarily while using TransMac.