Can someone of the more experienced members clarify me a wright procedure for the replacement of the heads on the hard disk.
To exclude what is initially assumed, the use of appropriate dr tools in a clean room and of course a good knowledge of the complete mechanical assembly of one hard drive and how their work.
In fact what most interested me, whether it is enough just to make replacement defective heads with good one, or after that there is still some additional adjustments in order to obtain the desired data.
After reading various forums and most posts, is not clear to me what happens to the hard drive after such a complicated action, some argue that it is enough just to replace defective heads with the "appropriate" donor one, while others claim that after the replacement has to synchronize (aligh) the new heads.

What is meant by aligh heads and whether it is really necessary to see the data on disk.
Who is wright in this case?

For the umpteenth time, heads replacement is not DIY.

Do I go onto motor mechanic forums and ask how I can change the engine in my car for free? NO!! I take it to a garage.

Sure I can top up the oil, pump up the tyres and so forth, and even maybe push the spark plug connectors home. But engine replacement is clearly beyond DIY so I wouldn't even think about tinkering with it.

Period.

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I totally agree with pcimage.
You have to be with alot of experience and after many drives that you replaced their heads.
Aftere all, heads swap it doesn't like motherboard swap in your computer or any other part due to the fact that a little move that you do wrong and you ruin your data or in the good case just make much harder the recovery process after that that.
Sorry not to be helpfull to you but you have to understand that after all we are talking about very complicated action with trade secrets.

Tip for a start, try to watch some youtube videos for that.
Good Luck!

Ok i am very sorry for my post, but i didn't ask you to told me how to do a head replacement, and I didn't planned to do that.
I guess when I go to the mechanic i may ask him aside from replacing the engine whether i need something else like tweaking valves and the similar stuff.

Sorry, I forgot the "(c) BlackST 2010"

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Tweaking valves usually involves removing the head -if you lucky it wont warp; if it does you need to trim it and make a custom gasket not to change the combustive pressure (other wise you will burn lean or to much) - In most "ford" type cars if you can 'tweak' the valves but you still need experience (carburettor) and computers (ECU controlled) to set things ok - or it wont start / idle / accelerate (and if its a 12cylinder 5litre Jaguar block you are tweaking - your destined to KNACKER that engine! what ever piece you disconnect ' tweak)


In hdd terms the "ford" would be - N/A
In hdd terms the 12cyl Jag engine - Not all but most HDD's

So apply that analogy to the hard drive trade - and you still will have 5% success even if somebody told you.
And that's not being optimistic because the chances you hit that 5% chance is 1 in 6 (if you diagnosed the problem correctly)

Maybe we could make some more analogies?

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Trying hard not to touch the HDD DIY discussion, not even with a long stick

But the motor analogy can back fire. Actually it is quite easy to swap the engine of a car if you are slightly interested in car/motor mechanics and do possess some basic tools. That even include semi advanced stuff like head work and replacing valves. Getting answers on web forums on compatibility and such can make the job even easier. And besides that, book shops are choke full of service manuals for cars, detailing almost any repair job in single step descriptions.

The way to venture into unknown areas is to have a humble attitude to the task, and invest plenty of research before you start to work. In other words find out what is possible to do, and what is not.

I reckon most bright DIY persons visiting this site do understand that a head replacement is a job which should be handled by professionals. But as most youtube movies show the task as quite easy, it is no surprise that many wonders if a cleanroom and some training are the only obstacles. And we can't blame them for asking. I guess the starting point for most professionals frequenting this site was a curious technical mind

I advise you not to open your drive. See the following article for an inside view.

Head Stack Replacement: Questions and Answers:
http://hddguru.com/content/en/articles/ ... k-Q-and-A/

If you do decide you want to give it a try, you may like to ask the OP in this thread:
viewtopic.php?f=1&t=17008#p113877

I'm assuming the OP is a DIY-er.

Otherwise, see Scott Moulton's videos on YouTube.

All the youtube homebrew HS videos I saw never show the drive working again and getting data out from it, and all were simple, small drives. Try with actual 4 - 5 platters 8 - 10 heads and see... So the answer is still the same : my arse.

Too bad that DR isnt like cars . I cant pick up a book on how to change a head on x type off HDD at the lcoal carboot like on how to reassemble a 2.0l 16valve GM carb - without using a timing light ahah-- god we all wish DR was as easy as fixing a car engine.. Atleast the is no oil and grease involved .. that made me sick some days.. black finder nails.. disgusting.. any way- it was a bad analagy.. We should have used like a Nasa rocket engine or something...

You just need to experiment and find out how to change the heads on your model.. it will cost.. but so does University..

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one more opinion Heads change is not DIY.

you should contact a DR LAB for that.

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That would be an even worse analogy as rocket engines are simpler in operation than the engine in your car, with SRB's a little kid will grasp the concept. The main issue though is the materials involved wrt to stress, vibration etc but the actual operation is simple

Well so are Hard drives- a normal stepper motor and actuator that is like operation in remote control cars or planes.. but the materials , stress and vibration is very important..

So - i think the analogy is good to this one. because if i let bob tweak my simple rocket engine- it would blow up - so if john tweaked the heads inside my hard drive... it could blow up... but it would most probably just not work

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The OP has requested parts in the past so I guess he has some experience:-

1) ST3500820AS
PCB: 100468972
Both drive and pcb wanted

2) WD2500JS-60NCB1
PCB: 2061-701335-B00AJ
Both the drive and pcb wanted

3) ST31000340AS
PCB: 100468979
Both the drive and pcb are wanted


Please let me know if you have any of the above.
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If you do decide you want to give it a try, you may like to ask the OP in this thread:
viewtopic.php?f=1&t=17008#p113877

I'm assuming the OP is a DIY-er.

Otherwise, see Scott Moulton's videos on YouTube.[/quote]

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