Nand flash questions

[bonx]

Hi everyone,

I'm looking for informations about nand flash on ps3.

I don't understand how ECC is computed (it's different from the wii)
I think that each ECC is 10 bytes long for 512 bytes of data.
For 512 bytes equals to FF, i have an ECC equal to FF FF FF FF FF FF FF FF FF FF
For 512 bytes equals to 00, i have an ECC equal to BB 62 1A 73 BB 52 C9 28 68 F7

I have no idea about bad blocks management: i try to replace ps3 nands by other
ones, but it doesn't work because of thoses bad blocks.
Any information will be appreciated.

Regards.