Windows’ Fast Startup feature can place drives in a hybrid lock state.

For power users, finding exactly which program locks the drive is best.

Check your System Tray (bottom right corner). Close any disk utilities, antivirus scanners, or cloud storage apps (like OneDrive or Dropbox) that might be "watching" the drive for changes. 3. Use Diskpart to Clean the Drive (Most Effective)

The "TransMac drive has been locked by another program" error typically occurs when TransMac, a popular software for managing and accessing Mac files on Windows, encounters a problem accessing a drive or volume. The error message indicates that another program or process has locked the drive, preventing TransMac from performing the desired action.