Express Card 34 contains two (2) eSATA 300 ports and offers a data transfer rate of up to 3GBps!
Bootable via eSATA port with Core 2 Duo MacBook Pro. This card works with Core Duo MacBook, but it's not bootable.

Supports MacBook Pro 15"/17" with ExpressCard slot.

JMicron chipset
Suports OS X 10.5 or later. 10.4 is not supported.
No driver software is required. Fully Plug & Play.
Comes with bulk package.