| Aspect | WD Marvel Tool (v526) | WD Data Lifeguard / Drive Utilities | |--------|----------------------|--------------------------------------| | | Firmware (service area) | User area (LBA only) | | Repair scope | Physical & logical defects | Only logical errors / surface scan | | Skill required | Advanced (HDD firmware knowledge) | Basic (end-user) | | Brick risk | High | None | | Cost | Free–$50 (unofficial) | Free (official) |