Installing Windows 10 to an external drive creates a (often called "Windows To Go") that you can boot on different computers without affecting their internal drives. ⚠️ Critical Safety Warning

Open the application. If your external drive isn't showing up, check the box for "List USB Hard Drives" under advanced drive properties.

Rufus is widely considered the fastest and easiest method for creating a portable Windows drive.

Microsoft officially discontinued Windows To Go in Windows 10 version 2004. While installation is still possible, expect:

At least 32 GB of free space is required, though 64 GB or more is ideal for updates and apps.

dism /apply-image /imagefile:D:\sources\install.wim /index:1 /applydir:E:\

Download and install Rufus . Step 2: Insert the external hard drive (back up data first). Step 3: Open Rufus as administrator. Step 4: Under Device , select your external drive. Step 5: Click SELECT and choose the Windows 10 ISO. Step 6: Under Image option , choose Windows To Go . Step 7: Partition scheme: GPT for UEFI, MBR for legacy BIOS (rare). Step 8: Click START . Confirm warnings about data loss. Step 9: Wait for completion (10–30 minutes).

Determine the Windows Edition Index. The install.wim file contains multiple editions (Home, Pro, etc.).

Move any important files from your external drive to another location before starting.