Transmac Drive Has Been Locked By Another Program -

Understanding and Fixing the "TransMac Drive Locked" Error When using TransMac to create bootable macOS installers or manage Apple-formatted drives on Windows, users frequently encounter the error: "The drive has been locked by another program."

Quick checklist (try in this order)

1. Close TransMac and reopen it.
2. Eject/unmount the drive safely (use OS file manager or system tray) and reconnect it.
3. Reboot the PC — this clears locks from hung processes.
4. Ensure no other app is using the drive: File Explorer/Finder, Disk Utility, backup software, antivirus, virtualization tools, or image-mounting utilities. Close them.
5. Run TransMac as Administrator (right-click → Run as administrator).
6. If the target is a DMG/ISO file, make sure it’s not already mounted by your OS or another imaging tool.

• For Windows Defender:

  Exclusions: Alternatively, add TransMac.exe to the Windows Security Exclusions list to allow it to operate without disabling global protection. 3. Clear the Drive with Diskpart Transmac Drive Has Been Locked By Another Program

  1. Go to Settings > Privacy & Security > Virus & threat protection.
  2. Click "Manage settings".
  3. Turn off Real-time protection (temporarily).