I thought I remember there being adapters which allowed you to use regular 2.5inch hard drives on the xbox 360. Maybe my mind is just tricking me again though.
- 2.0.9199.0 — April 6, 2010 — Allows up to two USB flash drives or external hard drives to be used for storing profiles, game saves, demos and more up to 16 GB each, 32GB combined.
- 2.0.16197.0 — October 16, 2012 — Added support for up to 32GB USB drives.
- 2.0.17349.0 — April 30, 2015 — Added: Able to use USB Storage up to 2TB for Xbox Content.
There was also the "Hard Drive Transfer Kit" SATA–USB adapter that became available alongside the 120GB HDD: https://www.engadget.com/2007-04-26-xbox-360-hard-drive-tran...