# Case Study: OneDrive Mac Migration

## Scenario

A large Serato DJ library was migrated from an older Mac to a newer Mac using OneDrive.

## Symptoms

- OneDrive client stuck syncing
- Duplicate OneDrive folders
- Thousands of files renamed with trailing ` 2`
- Serato reported many tracks as missing
- Some files existed on disk but still appeared orange in Serato

## Findings

- OneDrive sync state was rebuilt successfully
- Thousands of orphaned filename conflicts were repaired
- Some Serato references were stale database objects, not missing files
- Smart/dynamic crates should be classified separately from static user crates

## Lessons

- Filesystem health and Serato database health are separate problems
- Smart crates should not be treated the same as static crates
- Repair tools must be read-only by default and generate a plan before changing anything