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Changing the PCB on an MHV2120AH

  • Hard Drives
  • Disk Management
  • Fujitsu
  • Storage
Last response: in Storage
September 19, 2012 7:58:21 AM

Hi all

I had a blown Fujitsu MHV2120AH IDE 2.5" Hard drive.
I match the PCB to another one and swapped the them over.
The hard disk now spins up and the disk management detects the hard drive.

However the disk management shows the hard disk is 5MB RAW

What is the cause of this?

What can I do to fix this?

I have taken a image of the Disk management

Any help will be welcome

Currently I have got lots of these PCB and dead hard drives so any info will be great



More about : changing pcb mhv2120ah

a c 336 G Storage
September 19, 2012 4:47:50 PM

How do either of the following utilities detect the drive? Could you post a full report?

HD Sentinel (DOS / Windows / Linux):

HDDScan for Windows:

I'm wondering whether one of the IDE data pins is faulty, or perhaps the serial flash memory IC may need to be transferred. Otherwise, the drive may have an internal fault.

Is HD Sentinel able to detect the board on its own, ie while it is detached from the drive?

BTW, there is a 2A fuse near the +5V pins in the IDE connector. You may like to check this fuse in your dead boards.

September 20, 2012 8:06:05 AM


Thanks for the help as I am new to this.

I connected the hard drive to PC and used HD Sentinel Below shows a snap shot

When I just connect the PCB only to HD Sentinel. The PCB was not detected by HD Sentinel

My next step will be to changethe serial Flash memory IC ??

The dead boards I have got have been over voltage and I will go through them soon

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a c 336 G Storage
September 20, 2012 8:17:10 PM

I can't see any details about the physical disk in your screenshot. All we know for sure is that there is a single 5MB partition with a logical FAT volume, and Disk Management is telling us that this logical volume is corrupt (RAW).

I suggest you go to Report -> Save TXT Report and paste the resulting file contents into your next reply.
a c 336 G Storage
September 21, 2012 8:37:30 AM

ISTM that the drive is working OK. However, its capacity appears to have been cut by a HPA.

Are these OEM drives? Did they come out a Dell, HP, Compaq, Lenovo, etc?

You could try restoring the full factory capacity using HDAT2.

See page 5 of the HDAT2 user guide:

You could also try the HDD Capacity Restore Tool:

... or Hitachi's Feature Tool: