where's the BIOS chip on a WD6400AAKS-22A7B2 PCB?

wojciech06 · Nov 20, 2013

My hard drive won't boot up and I think the problem is the damaged circuit board. I've already bought a new one from the same model but it doesn't work. The hard drive will spin now but it's not recognized by my pc. I think I may have to swap the BIOS chip from the old PCB. Where is the BIOS chip located on the PCB? http:// http://

lonewolf7 · Nov 20, 2013

Just wait for "fzabkar" to look at your thread. He is the one who can give you a better answer.

fzabkar · Nov 21, 2013

The usual location for the serial flash memory (aka "ROM") is U12. Unfortunately U12 is vacant, which means that this information is embedded within the Marvell MCU (8818845D-BHG2).

Does your original PCB spin up the drive?

wojciech06 · Nov 21, 2013

fzabkar :

No, the original doesn't spin up the drive.

fzabkar · Nov 21, 2013

There is a WDR tool that may be able to regenerate the ROM on the donor board from a backup in the System Area on the platters.

See http://malthus.zapto.org/viewtopic.php?t=84&p=1950#p1950

wojciech06 · Nov 21, 2013

fzabkar :

Thank you. I have ordered a new sata cable to connect the hard drive with the new PCB to my pc which is now running on an ssd. Recently I bought a new ssd for my pc, and started using the old WD hard drive as an external drive and I think it was the external case that damaged the PCB on the hard drive. Soon I'll let you know if the WDR tool worked for me. Thanks again.

fzabkar · Nov 21, 2013

Check the TV diodes on the damaged board.

See http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html

... and http://www.users.on.net/~fzabkar/HDD/bigcircuitboard_diodes.jpg

wojciech06 · Nov 29, 2013

I got a new PCB. The hard drive starts spinning now and I can hear the head searching for data for a short while and then it stops searching but the drive keeps spinning. I was hoping to fix the problem with the WDR tools but WDR 3.0 does not detect the hard drive with a new PCB. Do I need a different version of WDR tools?

fzabkar · Nov 29, 2013

You may get better help at The HDD Oracle:

http://malthus.zapto.org

wojciech06 · Dec 1, 2013

fzabkar :

Would you have any idea where I could the relevant software from?

fzabkar · Dec 4, 2013

You can get the software via The HDD Oracle. In fact "Spildit" (from the Oracle) is currently helping someone with a similar problem at HDD Guru.

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where's the BIOS chip on a WD6400AAKS-22A7B2 PCB?

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