Transmac Drive Has Been Locked By Another Program Hot Jun 2026

Windows enforces strict data security boundaries. Software requiring direct block-level access to a drive—such as TransMac writing an Apple HFS+ or APFS filesystem—must request an exclusive lock from the operating system.

Post: I’m trying to use TransMac to access a drive (external HDD/USB) but get the error: “Drive has been locked by another program.” I’ve tried disconnecting/reconnecting and restarting TransMac, but no luck. Any ideas?

: Ensure no File Explorer windows are open to the drive. Close any other disk management software (like Disk Management or Partition Magic). transmac drive has been locked by another program hot

Type select disk X (replace X with your actual USB drive number). Type clean and press Enter to wipe the partition data. Type convert gpt if creating a modern macOS bootable drive.

: Try a different port, ideally a direct motherboard port rather than a hub. Write-Protect Switch Windows enforces strict data security boundaries

“Drive has been locked by another program” (sometimes followed by the word “hot” or a similar lock flag)

Open and run:

Close any third-party disk management tools, ISO burners, or partition managers (like Rufus, Etcher, or MiniTool).

Are you trying to create a bootable drive for a , or are you just trying to access files on a Mac-formatted drive? Any ideas

Programs like OneDrive, Dropbox, or Google Drive attempting to back up the external device. Step-by-Step Fixes for the TransMac Lock Error 1. Run TransMac as Administrator