Swapping PCB for Seagate Barracuda 7200.11

5 posts in this topic


Is there a way to swap the PCB of Seagate drives of the same model but which do have slightly different product numbers and firmwares?

The short answer is "no". Now, what about the long answer?

Is this possible by upgrading firmware and swapping chips?

Drive model: ST3500620 (Seagate Barracuda, 500 Gb, 7200.11)

P/N (old) 98X144-021

P/N (new) 98X144-033

Firmware (old): HP12

Fireware (new): DE12 (should be swapped to HP12)

For both drives:

PCB 100466726



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AISI, all you would need to do would be to transfer the 8-pin serial flash memory chip. Be very careful, though. If you damage this chip, then data recovery will become extremely expensive, if not impossible.

The best way to transfer the chip's contents is with an SOIC/SOP chip clip plus a chip programmer.

This database should help you identify the chip:


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Thank you.

I can see two 8-pin chips :

a. First chip is near the SATA ports

b. Second chip is near the left border when the circuit is oriented in such a way that the SATA ports are top

Which one should be swapped ?


The labels on the chips are:

a. Old





a. New (fast unreadable)




b. Old




b. New





If not using a chip programmer, is using a hot air gun better than using a solder iron ?

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Swap the 25X40L002 and 25FW408A chips.

W25X40L, Winbond, 4Mbit, 2.3V - 3.6V serial flash memory with 4KB sectors and dual output SPI:


LE25FW408A, Sanyo, NOR type serial flash memory, MSOP8, 2.7 to 3.6 V, 4MB, SPIO/3:


The others chips are FETKYs:


FDFS2P102A, Integrated P-Channel PowerTrench® MOSFET and Schottky Diode, Fairchild, 20V, 3.3A:


A hot air gun is easier but more dangerous than a soldering iron in some respects. I suggest that you practice on the replacement board first.

BTW, if the drive spins up, then the board is probably OK.

Edited by fzabkar

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Thanks. Good idea to practice on the replacement board first.

I assumed the board was OK, as it was responding in the Hyperterminal when following the procedure for the BSY ("busy") bug. However, Ctrl+z never worked after the drive was turned off and on.

But this is another topic.

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