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....

The Addonics 5X1 eSATA Port Multiplier (PM) and eSATA Port Multiplier for Rackmount Systems enables SATA hard drives to be configured for a wide range of storage applications. Build to fit perfectly into the Addonics Storage Tower and many standard 2 bay or larger SCSI enclosures, these Port Multipliers can combine up to 5 SATA hard drives into one eSATA connection....

2 eSATA ports - Serial ATA 1.0 compliant - 150 MBytes/sec - PC card 32-bit CardBus compliant - SATA chip set SIL3124 - Independent 256-byte FIFOs (32 bit * 64 deep) per Serial ATA channel for host reads and writes - Supports Spread Spectrum in receiver - Drivers for Windows NT 4.0, 98SE, Me, 2000 and XP....