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For frequent use, invest in an external NVMe SSD enclosure with USB 3.2 Gen 2 for near-internal performance. Always keep a backup of data on the external drive.

diskpart list disk select disk X (X = your external drive number) clean convert gpt create partition primary size=0 format fs=ntfs quick assign letter=W exit

Installing Windows 10 on an external hard drive is a great way to create a portable Windows installation that you can use on any computer. By following this guide, you should be able to successfully install Windows 10 on an external hard drive. However, keep in mind that performance and compatibility may vary depending on the computer and external hard drive you're using.

Then proceed with Rufus as described.