Your existing array is running a WD201KFGX and you need a drop-in replacement that matches spec without a firmware mismatch headache. This WD Red Pro 20TB (WD201KFGX replacement) slots straight into your 3.5-inch bay, keeps the same 7200RPM and 512MB cache profile, and carries the same NASware 3.0 tuning for up to 24-bay systems. No reformatting surprises, no compatibility guesswork. 5-year warranty on top
| brand | Western Digital |
| capacity | 20TB |
| form_factor | 3.5-inch |
| interface | SATA3 |
| rpm | 7200 |
| cache_size | 512MB |
| recording_technology | CMR |
| workload_rating | 300TB/year |
| max_bay_support | 24-bay NAS |
| firmware | NASware 3.0 |
| warranty | 5-year limited |
| operating_mode | 24x7 |
| replacement_for | WD201KFGX |
