If you decide to proceed with WDR, approach it with appropriate caution: use isolated hardware, maintain thorough backups, accept that some drives cannot be repaired, and never experiment on data you cannot afford to lose.
Symptoms: Drive takes 30+ seconds to show in BIOS, HDDScan shows access time >500ms, but eventually works.
If you proceed, ensure you have the MQJ hardware, an old PC with a native SATA controller, and a copy of the matching "General Flashing" firmware. Always backup your original ROM first.