Hello.
my 4TB WD RED died after 4 years in home NAS -no heavy use. I was copying data to NAS when NAS gave me error, something like HDD not detected. Reboot wont help, so i plugged it into PC, but HDD is not ever recognized by PC BIOS. The disk "sounds normal" (engine and heads are moving), just not recognized. Is there any way how to fix it? I'm not worried about the data, i have backup, but i would like to fix the disk. I'm thinking to replace PCB.
1. Any advise if PCB replacement may fix this?
2. Is there chance the disk will work without BIOS chip replacement? -I mean should i try to run the disk without replacing BIOS? Can i cause any damage by running it with incompatible bios chip? (i'm not concerned about the data)
3. That's it, just two questions

Don't waste your time, as it is not a PCB problem.
Likely bad sectors and possible firmware issues. No need to try to address those problems as the drive cannot be trusted after.
Try to wipe it if you can, then sell for parts with honest explanation to recover some value.

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Hard Disk Drive, SSD, USB Drive and RAID Data Recovery Specialist in Massachusetts

Totally agree, it's not a PCB issue and the drive should not be trusted again, even after a "repair" which would only cosmetic at best.

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so i guess i will just drill 3 holes into it and throw it away
i bought another WD Red just few days before this one died and i cant say i feel good about my choice. Would you suggest some other brand for NAS? I was thinking to buy Seagate ironhawk pro when i will buy next HDD

Does not really matter, as they all fail. Seagate is probably worse statistically.

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Hard Disk Drive, SSD, USB Drive and RAID Data Recovery Specialist in Massachusetts