how to change serial namber of hdd (correct way)

[mov45]

Hi I have old seagate HDD 500GB and just for knolage want to change serial number.

So to now I find a chip on board where I download firmware (eeprom) edyting by hex (bin file) found in two places serial number then just in bouth places i change letter 3 to 1, then reload rom by programer, all fine to this way, but when i connect to pc to try to everything is fine HDD is not recognised by system. Now is the question is serial number only in chip bios or I miss something?
If I upload old rom with serial - recognised fine

[ghimpe--]

Have you considered checksum?

[mov45]

No i didn't can you told me how to do this?
ps. even when i also change a name of disk also didn't work, perhaps you checksum is a answer...

[fzabkar]

F3romExplorer:
http://www.hddoracle.com/viewtopic.php?f=22&t=2534

[mov45]

thank you for software but i wanna make it in hexcode to learn something

i didn't know about this checksum, how to use it?