Transmac Drive Has Been Locked By Another Program Hot Jun 2026

Antivirus software, cloud storage syncing apps, and system utilities often lock external drives to scan them. Press Ctrl + Shift + Esc to open .

Before applying the fix, it helps to understand the cause. Windows treats external drives differently than macOS does. The error typically occurs for one of three reasons:

Type list disk and look for your USB drive number (e.g., Disk 1 or Disk 2 based on storage size).

The error occurs when the Windows operating system or a background security tool restricts administrative access to your flash drive. This problem usually stops users from formatting a disk or writing a macOS .dmg file to create a bootable installer. transmac drive has been locked by another program hot

TransMac requires high-level system permissions to manage disk partitions.

A file on the USB drive is currently open in another program (e.g., a text file or image).

Windows File Explorer aggressively tries to read external storage. If it is viewing the drive, TransMac will be locked out. Close every open folder and window. Antivirus software, cloud storage syncing apps, and system

to see all connected drives. Identify your USB drive by its size (e.g., Disk 1 or Disk 2). select disk X with your USB drive's number). Be extremely careful to select the correct disk and press Enter. This removes all partition info and locks. create partition primary and attempt to format or restore the disk again. Alternative Tools

and look for any processes related to disk utilities or cloud syncing that might be active. 5. Hardware Troubleshooting

: Windows may be trying to index the drive for search. Windows treats external drives differently than macOS does

By following these steps, you should be able to resolve the "drive has been locked" error and successfully create your bootable macOS media in TransMac. The best free partition tools to clean stubborn drives.

Type list disk and press . Note the disk number assigned to your USB flash drive (you can identify it by its storage size).

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.

To help find the absolute fastest solution for your setup, please tell me: What are you currently using? What macOS version is the .dmg file you are trying to burn?

Antivirus programs immediately lock new USB drives to scan them for threats. This split-second lock is enough to crash TransMac’s operations.