Hello,
I could not see the video as it is no longer available, and consequently cannot hear the noise pattern to know if it involves a high risk of serious media damage.
Likely the head swap has been done without the necessary know-how and proper equipment (clean bench, globes, surgeon cap, the proper tools).
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Data is indeed of some value, but not worth $2000+ needed for a professionnal data recovery.
The cost of a data recovery depends on several factors (difficulty, level of expertise, cost of life, price of parts, a.s.o.) and a decent price helps companies not giving up too early on difficult cases: those that require more attempts, more labor, than easy ones.
Before your attempt, your case was likely in a 500$-1500$ price range by many professional data recovery companies.
I assume that you contaminated the platters by opening the hard drive without a clean bench.
In such a situation, I would strongly advice picking a data recovery lab that has expertise (or at least some experience) in platters decontamination. I believe that this remains a hand-crafted process, still quite experimental nowadays, with R&D from some labs.
You can expect a substantial higher cost than originally, because of the necessary decontamination which is not an easy task, and the possible serious media damage. Also expect the chances of a successful recovery being much lower than initially.
If the data recovery succeeds, the strong media damages may have lowered the percentage of recoverable files and the quality of the tree reconstruction.
Telling about your current budget for this recovery would help knowing if it is still worth attempting something.
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(...) heads have been changed by myself from an identical brand new drive (...)
Apart from the fact that the recovery had do be done by a truly professional lab, are your sure that your donor was really compatible?
There are no less than 7 variants of the WD5000AAKS, determined from the 3rd letter after the dash in the full model name :
°°A7B°, °°D2B°, °°TMA°, °°V0A°, °°V1A°, °°YGA° and °°Z1A°. These variants which belong to 5 different families:
Atlantis, Tahoe, Tahoe PL, Tornado 2D and Tornado 3D.
Your donor had to be the same variant, or at least to belong to the same family (or a compatible family).
Example of the "A7B" variant :
https://drive-for-parts.com/WD5000AAKS-A7B(Other variants can be reached at the bottom of the linked page.)
Furthermore, you have to match same heads, given by the DCM (typically ...T2... vs ...TJ...). Preferably also match the country of manufacture and have quite similar Microjogs values.
Example page showing what has to match:
https://drive-for-parts.com/WD5000AAKS- ... RIVE-D1047