The 2 Port eSATA ExpressCard enhance your laptop system with two eSATA II ports from a single Express Card slot. Each eSATA II port provides a maximum of 300 MB/sec data throughput through SATA II. You can also attach to each eSATA port as many as 5 hard drives in external drive enclosures that have built-in Port Multiplier technology, such as the Addonics Storage Tower. Together with Addonics' family of eSATA cabling system, Notebook users can enjoy the fastest performance with any external storage devices, as much as 6 times the data transfer rate of the USB 2.0.
Works on MAC2/28/2009
This is the second expresscard with eSATA interface that I have bought. The first worked for simple transfers of data files but was very slow. When I needed to use final cut pro with large video files the transfer rate was so slow with prior card it would lockup my macbook pro. I got this card and everything works well. Now the external hard drive is fully functional. If you have a Macbook Pro this is the card to go with.
Forget USB 2.02/17/2008
Once you have used this, you'll never go back to USB 2.0. I bought an eSata enclosure, a drive and this card. It's the fastest drive on my laptop. It beats the internal 7200 rpm drive, hands-down. Vista knows the card out of the box, no driver to install. It couldn't have been easier.