Transmac Drive Has Been Locked By Another Program May 2026

Fix: "TransMac Drive Has Been Locked By Another Program" Creating a bootable macOS USB on Windows can be tricky, especially when TransMac throws the frustrating "Drive Has Been Locked By Another Program" "Could Not Access Disk/Media"

If the drive has existing partitions (like an old Mac partition or a corrupted bootloader), Windows may lock it automatically. Using the Command Prompt to "clean" the drive often resolves this. Open Command Prompt as Administrator. Type diskpart and press Enter.

Never use Ignore if Windows is currently copying files to the drive or if an antivirus scan is running. Doing so can result in total data loss or a corrupted partition table. Transmac Drive Has Been Locked By Another Program

What is Transmac?

Try a Different Port: 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 Fix: "TransMac Drive Has Been Locked By Another

often block TransMac from writing to the raw disk to prevent potential "threats". Active Background Tasks

: If you have a File Explorer window open to the USB drive, Windows maintains a handle on the device, locking it from other software. Windows Disk Indexing Type diskpart and press Enter

Here’s a concise review of the error message "Transmac Drive Has Been Locked By Another Program":

Type list disk to find your USB drive's number (verify by its size).