Troubleshooting & messages · Storage Studio itself
What does "Part of this is on your drive, which isn't connected" mean in Reset?
Short answer: Part of that item (such as the Recycle Vault) lives on your external drive, which is unplugged. Reset holds it back so nothing is left half-removed — connect the drive and run it again.
Some of what you chose to remove — for example the deleted files Storage Studio is keeping for you in the Recycle Vault — lives partly on your external drive. With the drive unplugged, Reset could only remove half of it, so it holds that item back.
Connect the drive and run Reset again so nothing is left behind.