Install Windows 10 From External Hard Drive Jun 2026

While Microsoft officially recommends using an 8 GB or larger USB flash drive to install Windows 10, external hard drives—often more readily available in larger capacities—can serve the same purpose. However, because external drives are typically formatted differently and may contain multiple partitions, the preparation process differs from that of a standard flash drive.

If you have files on the drive you want to keep, you can shrink the volume to create a small 8GB partition. install windows 10 from external hard drive

Rufus explicitly supports external hard drives. While Microsoft officially recommends using an 8 GB

| Factor | Flash Drive (USB 3.0) | External HDD (5400 RPM) | |--------|------------------------|--------------------------| | | ~5–10 min | ~15–30 min | | Installation speed | Fast | Moderate (slower read) | | Reusability | High (can be repurposed) | Lower (takes full drive) | | Portability | Excellent | Bulky | Rufus explicitly supports external hard drives

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