You are trying to flash a macOS bootable USB drive on Windows, but TransMac stops you with a frustrating error:
Select and click OK. (Note: You must use "Safely Remove Hardware" after this). End Tasks via Resource Monitor : Open the Run dialog ( ), type resmon.exe , and click OK. Go to the CPU tab and find Associated Handles . Type the drive letter (e.g., E: ) into the search box.
If another program is using the drive, you may need to force it to close. Right-click the taskbar and select .
If the error persists, restart your computer. A fresh reboot terminates all hidden software locks on your hardware components. Summary of Best Practices Transmac Drive Has Been Locked By Another Program
This single step is one of the most crucial for preventing permission-related lock errors. Running with administrator privileges gives TransMac the necessary access to perform disk-level operations.
(or other active backup software) Rufus or Etcher (if left open in the background)
Running TransMac without administrative privileges often results in access denied errors. How to Fix the "Locked" Drive You are trying to flash a macOS bootable
Many users report that the lock error occurs consistently with the same USB drive, even after rebooting. This points to .
utility is the most effective way to break a software lock by wiping the drive's partition table. Start Menu , right-click it, and select Run as Administrator and press Enter. to find the number of your USB drive (verify by size). select disk X with your drive number). to remove all partitions and locks. : If the drive still refuses to work, type create partition primary and format it as in File Explorer before trying TransMac again. 3. Temporarily Disable Real-Time Protection
The error is frustrating, but it is rarely a bug in Transmac. It is almost always a conflict with Windows’ own resource management. By systematically restarting File Explorer, disabling antivirus, using LockHunter, and disabling Fast Startup, you can reclaim control of your drive in under five minutes. Go to the CPU tab and find Associated Handles
Alex stared at the screen, his reflection a ghost in the dark glass. The error message glowed like a warning flare:
Since you are preparing a bootable macOS drive, it appears you might be setting up a Hackintosh system or recovering an older Apple computer. Would you like assistance troubleshooting the or setting up the correct OpenCore bootloader configurations next? Share public link
If you are encountering this error, here is a review of the solutions ranked by effectiveness: