@ terminator2 It must be *really* my eyes here... or my glasses (probably both)

You posted "SANYO 25FU406B" and i searched for the ROM ID in my DB but instead of 25FU406B i searched for 25FS406 (Sanyo 1.8v)
and got a match of suggested seagate model ST500LT012 which i asked u about...

Now, back again to your main question here

based on your drive model, its Pharaoh (ID: 3F) (ROM 512k)

Why your programmer reads as 128k?? --->>> coz ur reading via clips (not stable specially with 512k) any slight move will give u the wrong ROM file

Why ur 3K reads as 1024k?? most probably the terminal adapter (original adapters will auto assign reading voltage)

and btw, the pcb # (which i asked you about) can be found on the backside of the PCB starts with 100xxxxx

Finally, I advice you to buy a good programmer (the image u posted filled with FFFF is probably from the clips right? >>> not stable)

good luck

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Kuwait Data Recovery - UNIX GTC
The only reason for time is so that everything doesn't happen at once. By: Albert Einstein

Thanks einstein9
Fortunately Artur ( developer and owner of Revealprog ) is back from vacation he has shown me right connection method.
With the help of all of you now I am looking for most efficient Rom reading.
Thank you all of you.
I will be needing your special help , sending you message in PM.

Revel Programmer is an excellent tool. For me the best so far.
Except the Pomona clips that is not easy to work with.

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

Generally speaking, those ROMs can take from 1.8v to 5v without degrading, although the suggested maximum would be around 3v. Anyhow, just make sure that your PCB has a couple of diodes next to the ROM, those should precent your programmer from killing any components in the path. If you already checked that and removing the chip isn't an option, try taping (literally) the 8th pin and then put the clip on, I'm not exactly sure why it works, but I guarantee you that it does sometimes.

Great

That sounds BS generally speaking. I had to recover a seagate rom after somebody killed the orig one with a 3.3V reader.
Inputs might tolerate higher voltage signals, but i am pretty sure that an 1.8V serial flash won't like 5V as Vcc.

pepe

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Adatmentés - Data recovery

I literally said generally speaking, because most chips won't die if you use a 3.3v programmer on them. And that's what I meant generally -> most. I'm not saying it's right, I'm just saying that maybe using it once or twice won't kill the device, not in the short term at least.