Transmac Drive Has Been Locked By Another Program Hot May 2026

The "drive locked by another program" error in TransMac typically occurs because a background Windows service or security application has claimed exclusive access to the USB drive, preventing TransMac from formatting or writing to it. Why This Happens Common culprits that "lock" your drive include:

Run as Administrator

TransMac requires elevated privileges to perform disk-level operations. Ensure you right-click the TransMac icon and select Run as Administrator . transmac drive has been locked by another program hot

2. Force Unlock the Drive in Windows

Step 4: Reformat in TransMac.

Now, go back to TransMac , right-click the drive, and select "Format Disk for Mac." It should now be unlocked and ready for your DMG. The "drive locked by another program" error in

Disable Windows Defender Real-Time Protection

: This is the most common fix. Windows Defender often "locks" a drive when it detects a new volume or format being written. Go to Control Panel → Power Options →

If Windows has "half-formatted" the drive, it might be stuck in a mounting loop. You can force it to let go using Command Prompt as Administrator. and hit Enter. to find your USB’s number (e.g., Disk 2). select disk X (replace X with your number— be careful here

"Could not access disk/media"

Creating a macOS bootable installer on Windows is a lifesaver, but seeing the or "Drive is locked by another program" error in TransMac can bring your progress to a halt. This usually happens because Windows is protecting the drive from the low-level changes TransMac needs to make.

1. Go to Control Panel → Power Options → Choose what the power buttons do.
2. Click Change settings that are currently unavailable.
3. Uncheck Turn on fast startup (recommended).
4. Click Save changes.
5. Restart your computer (not shutdown, restart).

: If you have a window open showing the contents of the USB drive, Windows is actively "using" it. Close all File Explorer windows. Ignore Windows Format Prompts