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. The 5 drives can be set up as individual drives, as RAID set or with JBOD to become one large hard drive depending on the controller. When multiple PMs are combined with Addonics 4-Port eSATA controller*, you can attach externally a whopping 20 SATA hard drives to your computer via 1 controller!
For more detail information on Port Multiplier technology, please review the following URL link:
http://www.sata-io.org/technology/port_multipliers.asp
5X1 eSATA Port Multiplier can be installed onto a standard PCI slot with optional PCI Converter Bracket (PCISCBKT),
allowing any desktop PC case to be used as a hard drive storage farm.

* Port Multiplier does not work with SATA controller that has no PM support. Check with your system supplier to confirm the PM support on your existing SATA port. Port Multiplier may require a utility to configure the drives to be seen inside the operating system.
For a comparison of features on our family of Port Multiplier, please review the comparison chart in the PM tutorial page.