it depends on the drive model you have, schematics are for BDM-001 and BDM-002.
from the devwiki page :
The drive controller contains a BGA-sized 2MB NOR flash memory chip for Blu-ray drive firmware code, with the contents encrypted. In addition to this, there is a 8MB SDRAM working memory chip. Each drive contains a unique identification number, possibly stored in the SPI Serial Interface Macronix EEPROM. This chip or the NOR flash chip probably stores the device key (and associated sequence keys), and the host private key.
i did not search any further, but if this is true it's only an 8pins ic.