Hard drive repair and data recovery information
  - Luckily, I was able to read from head 0 to enable the rest of the heads to be tested.
This drive had 4 out of 6 heads fail and I could read from head 0 and head 5, so I imaged Head 0 & head 5 only*

*Imaging is a bit by bit sector by sector clone of a hard drive to a functioning drive of equal or larger capacit.y

This can be caused from many things including an improper shutdown, voltage, switch failure, impact or normal wear and tear.

Much like a self test on a computer before it boots into the operating system, the Power On Self Test (POST)
this particular drive self tests each head before initialization. If a single head fails the drive will instantly click and spin down.

I had to replace the read\write heads to temporarily repair the hard drive to recover the data.

Okay that sounds simple enough, but lets look a little closer at exactly what I did and what I had to do to recover the data, including the matching of hard drive part numbers for the read\write heads and the data extraction process. First, I needed new read\write heads to replace the failed ones inside the hard drives assembly. All I needed was to image from head 1 to 4, as I had previously imaged 0 and 5.

Hard drives tracks are laid on the platters surface with the original heads!
This makes them unique to this drive. Finding exactly aligned matching read\write heads is possible but very rare, good luck with multiple purchases on eBay at sometimes ridiculous markup prices.

More Western digital successful repair examples:
Hard drive repair processes and equipment
The most important tool you MUST have if data is irreplaceable
I have designed this section to educate on the perils of self data recovery and the problems associated with a Western Digital hard drive faults and repair.

Remember if data is important please consider the experts!
Model
Malfunction
Solution
Outcome
WD5000KS-00MJB0 PCB-2061-701335-003 Rev B

Initializes slow and not seen in BIOS
-Cleaned contacts of PCB
-SA Check
-Bad modules, so replaced 2E-LOG, Module 2D-LOG Module, 32-RBBLIST (G-LIST Backup)
Drive now repaired and imaged.
WD5000AAVS-00ZTB0
Buzzing Sound
-Jammed spindle
-Platter transfer and alignment reconfiguration in compatible hard drive assembly
Rebuilt in our class 100 hepa filtered Clean Room.
WD200BB-00AUA1
Recognized but fails to read any sectors
-SA module check found modules 29 & 2D had failed
Replaced faulty modules & cloned .
WD1200BB-22GUA0

1 bad head (head 3)
-Cloned drive with head 3 disabled
-Reverse cloned drive with head 3 re-enabled ONLY (extended read time to 1000 milliseconds)
Head burnt in and finally began to read.
WD10001FALS-00J7B1



Dead PCB, no power
-Used PCB from matching donor hard drive of same model and firmware
-Drive spins but not recognized by system BIOS
-Backed up the modules of the hard drives system area, then generated New ROM using the generated backup to the donor PCB
PCB now compatible with the hard drive

Successfully repaired & recovered the data.
WD800JD-75MSA3
Clicking
-PCB # 2060-701335-005 REV A Mark 4
Swapped PCB with same tested functional board
-Transferred ROM chip U12 to good PCB
Now recognized and cloned no errors.
WD3000JS-60PDB0
Clicks in places
-PCB # 2060-701393-002 REV B Mark 1
Swapped PCB with same tested functional board
-Transferred ROM chip U12 to good PCB
Now recognized and cloned no errors.



First step in do it yourself hard drive repair
Western Digital Repair Examples
Western Digital Repair Examples
Western Digital Repair Examples
Western Digital Repair Examples
Western Digital Repair Examples
Western Digital Repair Examples
Western Digital hard drive repair and data recovery experience examples
NOTE: Jammed spindle siezures are not very common and are only found in rare cases, but most issues are a result of:   
    -Head Alignment
    -Read\write head compatibility
    -PCB Failure
    -SA system area faults
    -Modules 29 2d

This is an actual successful recovery from a clicking western digital hard drive:

WD2500JB
WD Caviar SE
WD2500JB-22REA0
DATE: 13 JAN 2007
DCM: HSCANTJAAN

Prognossis
Spins up, then clicks a couple of times and spins down

Repair Process
    In my experience this mostly indicates that a read/write head that has failed.
As this hard drive has 3 platters and 6 read\write heads this could mean that one or many that have failed… lets test.

    -I tested the failed parts using a technique that involves initializing the hard drive with only one head at a time enabled... this can be tricky as this requires the read\write head, which reads the drives ID or model details and to become ready, to enable this test…this may require a head replacement to even get to this step!
    -After the drive became recognized I had mapped the drive to enable or disable the required heads for imaging… e.g.: image the hard drive from head 0 only and not the failed heads.

Western digital hard drive repair