I use Google Translate. I'm sorry for my bad English.

I replaced the ST3500418AS PCB,and I also replaced the EEPROM.
But then I damaged the EEPROM. I think it was because I overheated the EEPROM with a soldering iron.

I think a lot of data in EEPROM is corrupted.
Even if the EEPROM is read, most of the data is "F" or "0".

Will the HDD be unrecoverable if the drive-specific information in the EEPROM is lost?
Thanks for reading this question. If anyone knows anything, please tell me.

If the part with RAP, CAP is damaged than there is no way to recover the data. Did you try to read it via programer?

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odzyskiwanie danych

that's false info, I can recover it.

pepe

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Adatmentés - Data recovery

Thank you for the reply:)

I read it using the CH341A programmer.
I'm a beginner, so I don't know the details, but it seems that this ROM does not contain normal data.

As shown in the picture, all data is 0 or F.

What would you normally do to recover from such a situation?

Firstly, it is not yet sure the chip is gone. please post the full flash image you grabbed from it, the prev pic shows pretty few of the full range.
Secondly, you should test your setup with a known good flash chip. 25X40 is 2.5V device, not sure if your reader is able to supply 2.5V. I haven't used this prog, neither did such adapter, but i am almost sure it works on 3.3V or maybe 5V.
The readout should be ok on 3.3V i think, but 5V is a way too high for these, so it can damage the flash.
I also built my reader around an FT board but with SW adjustable supply, so that it won't damage anything...

pepe

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Adatmentés - Data recovery

As you can imagine, this writer is operating at 3.3V.
  I thought it could not be read correctly because of the voltage.
  but, even if the HDD is connected to TTL, the message that the EEPROM cannot be read is displayed.
  This also suggests damage to the EEPROM.

And I also destroyed the EEPROM of the donor PCB. (Same reason)
So I can't test the setup.

Full ROM capture↓
https://www.dropbox.com/s/ph1lpzrhlyvg9 ... e.zip?dl=0

  Thank you very much.

As you can imagine, this writer is operating at 3.3V.
  I thought it could not be read correctly because of the voltage.
  However, even if the HDD is connected to TTL, I get a message that the EEPROM cannot be read.
  This also suggests damage to the EEPROM.

It is a capture of EEPROM, how should I send it? (It seems that the bin file cannot be pasted)

Thankyou:)

i think you can attach it zip-ed...

pepe

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Adatmentés - Data recovery

I'm sorry, I forgot the rudimentary method.

yes, it is pretty much empty.

What was the original problem with the patient pcb?
You could make a test with the donor's rom, wether you can read it.
I checked the datasheet, W25X40 is fine with 3.3V IO, so you won't cause any damage with 3.3V.
What i think is that it got overvoltage from outside, perhaps the PSU voltage went up or wrong PSU connections resulted in 12V suppiy instead of 5V, but these are just suppositions.
The preamp is subject to damage if the drive suffered such overvoltage, so it must be checked before attaching a working pcb.

pepe

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Adatmentés - Data recovery

It will be a little longer, but I will tell you the background.

1
6 years ago.
First, the first symptom of a patient's HDD was a sector defect.
After that, the patient's HDD stopped working at all.
The motor did not rotate and the head stopped moving.

2
Recently, I decided to recover the HDD.
Because I have memories.
I was examining the patient's PCB.
The motor controller heats up and smoke is emitted after a while.
At this point, I realized that the PCB was bad and decided to replace it.

3
I purchased a donor HDD-A.
The firmware was different, but I thought it would work if I replaced the EEPROM, so I ran it.
As a result, the motor rotated and the head moved, but it could not be read.
I thought this was because the parts on the PCB were slightly different. (Thinking now, I think it's the Barracuda 7200.12 Rock)
I gave up and returned the donor EEPROM to the donor PCB.
However, for some reason, the donor HDD-A also stopped working.
Changed to the patient EEPROM again.
This also doesn't work.
I thought it was creepy.
However, I thought that the PCB was destroyed by heating with a soldering iron.

Continue…

4
This time, I bought a donor HDD-B with the same firmware.
I replaced the patient's EEPROM with the PCB of the donor HDD-B.
However, I can't hear the sound of the motor or head.

The EEPROM of the donor HDD-B was returned to the PCB of the donor HDD-B.
However, that didn't work either.
This is the same phenomenon as “3”.

I attached the EEPROM of the donor HDD-A to the donor HDD-B.
Still, the HDD did not work.

I wondered.
I have destroyed 3 PCBs so far.

continue…

5
I connected the donor PCB to TTL.
I thought that the Barracuda 7200.12 might be locked.
But, an error message was displayed that the connection to the EEPROM could not be made.

I still could not determine that the EEPROM was defective.
The PCB may be broken.

Therefore, I only read the EEPROM.
After that, I found that all EEPROM records had errors.

I am poor English but thank you for reading.

Hm, this is a pretty nice story...

are you sure you soldered the ROM the right direction?
Anyway, it seems like you don't have too many options after all. There's not much point sending it to a DR company as they won't be able to solve the misssing rom scenario anyway (I don't have info about anybody being able to do it up till now). I can probably recover it send me a pm if you are interested.

pepe

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Adatmentés - Data recovery

I confirmed that the ROM installation direction was correct.
(I took a picture in advance)

How much is the recovery fee in such a case?
I am a high school student and have no money.
And Japan Post has stopped shipping packages overseas.
Sending to you now is difficult for these reasons.

I confirmed that the ROM mounting direction is correct.
(I took a picture in advance)

How much will it cost to recover?

I also want to restore it.

But I'm a high school student and haven't money.
And Japan Post has stopped shipping packages overseas.(Covid-19)
For these reasons it is difficult to send you immediately.