Transmac Drive Has Been Locked By Another Program

TransMac is a widely utilized utility for opening Mac APFS, HFS, and HFS+ formatted disk drives and DMG files on Windows operating systems. However, users frequently encounter the error message "Drive has been locked by another program" when attempting to write to, format, or restore disk images to a target drive. This paper explores the technical underpinnings of this error, identifies common conflicting software and system processes, and outlines a systematic approach to resolving the lock contention, ensuring successful drive manipulation.

Right-click "This PC" > > Services & Applications > Services . Find Windows Search , right-click it, and hit Stop . 🖥️ Method 3: Use the "Format Disk for Mac" Command

Alex looked at the error message one last time. The "OK" button was gone. In its place, a countdown had started: .

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He’d seen it before. Usually, it meant he’d left a Finder window open, or maybe Time Machine was doing a background check. A quick restart of his Mac always fixed it. But tonight was different.

Type list disk and press . Identify your USB drive number by looking at the storage capacity (e.g., Disk 1 or Disk 2). Warning: Selecting the wrong disk will erase your data.

Learn about standard troubleshooting steps for various error symptoms in the official TransMac Help guide TransMac is a widely utilized utility for opening

If you are trying to flash a DMG file to a USB drive and see the error you aren't alone. This usually happens because Windows is aggressively "protecting" the drive or another background process is scanning it the moment you plug it in.

You are trying to flash a macOS DMG file to a USB drive on Windows, but TransMac stops you with a frustrating error:

The "Drive has been locked by another program" error in TransMac typically occurs when a Windows process—such as File Explorer, an antivirus, or disk management service—is actively accessing or monitoring the USB drive, preventing TransMac from gaining the exclusive control needed to format or write to it . Right-click "This PC" > > Services & Applications > Services

Look for under the "Apps" or "Background processes" section. Right-click Windows Explorer and select Restart .

Go back to TransMac and try to again. 🔍 Method 2: Disable Anti-Virus and Indexing

Windows has built-in features that automatically scan or index newly inserted USB drives. These background tasks are the most common culprits behind the locking error. Terminate File Explorer