---
id: moving-folders.what-verification-levels-does-data-parking-offer
url: https://storagestudio.us/faq/moving-folders/what-verification-levels-does-data-parking-offer
category: "Moving folders"
subcategory: "Safety and verification"
question: "What do the Fast, Thorough and Off verification levels mean in Data Parking?"
alt_questions:
  - "Which verification level should I use?"
  - "Thorough vs Fast check"
  - "Should I turn verification off?"
  - "verify every byte storage studio"
  - "Is Fast verification enough?"
short_answer: "Fast (the default) compares size, modification time and permissions on both sides; Thorough compares every byte and is much slower; Off skips the separate check. Whichever you pick, the original isn't removed until the copy succeeds."
tags: ["verification", "data parking", "settings"]
related: ["https://storagestudio.us/faq/moving-folders/how-does-storage-studio-check-a-move-worked", "https://storagestudio.us/faq/moving-folders/how-do-i-change-data-parking-settings"]
applies_to: "all"
last_reviewed: 2026-10-01
---

# What do the Fast, Thorough and Off verification levels mean in Data Parking?

They set how carefully each Data Parking move is checked before the original is removed. **Fast** is the default and right for everyday moves; **Thorough** compares every byte; **Off** skips the separate check.

- **Fast** — compares each file's size, modification time and permissions on both sides, and looks closer only at files that differ. Quick.
- **Thorough** — reads every byte on both sides and compares them. Much slower; use it when you suspect a disk is misbehaving.
- **Off** — trusts the copy without a separate check. Fastest.

Whichever you choose, the original is never removed until the copy has succeeded. Change it from the gear in Data Parking's middle column.

See [How does Storage Studio check a move worked?](https://storagestudio.us/faq/moving-folders/how-does-storage-studio-check-a-move-worked)