Right-click the TransMac icon and select Run as Administrator . Without elevated permissions, TransMac often fails to override system locks.
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. Transmac Drive Has Been Locked By Another Program
Move the USB to a rear port (if on a desktop) to ensure a more stable connection. 🛠️ Method 1: Use Diskpart to "Clean" the Drive Right-click the TransMac icon and select Run as
Security software often "hooks" into a USB drive the second it's plugged in to scan for malware, creating a lock. Go back to TransMac and try to again
Go back to TransMac and try to again. 🔍 Method 2: Disable Anti-Virus and Indexing
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
Temporarily disable Windows Defender or your 3rd party antivirus (McAfee, Avast, etc.).