The Addonics 5X1 eSATA Hardware Port Multiplier (HPM) offers great performance and flexibility for building a reliable external hardware RAID storage. Connects up to 5 SATA / SATA II hard drives to any computer via a standard eSATA port, this HPM is compatible with any SATA controller, RAID or non RAID. Once the RAID configuration is set up, the entire RAID set can be moved to any computer. In addition, with the Addonics optional eSATA - USB adapter, the same RAID set can be attached to any computer via a USB 2.0 port.
Build to fit perfectly into the Addonics family of Storage Tower and many standard 2 bays or larger SCSI enclosure, the 5 hard drives can be set up as individual drives, as RAID set or as JBOD to become one large hard drive. When multiple HPMs are combined with any Addonics PM compatible 4-Port eSATA controller or 4 USB 2.0 ports, you can attach externally a whopping 20 SATA hard drives to your computer!
For more detail information on Port Multiplier technology, please review the following URL link:
http://www.sata-io.org/technology/port_multipliers.asp
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Illustration showing connections from the Storage Tower/Mini Storage Tower with integrated HPM to computer
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5X1 eSATA Hardware 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.

* Independent drive configuration is only supported with controllers with Silicon Image SIL3124 or SIL3132 chip set.
5X1 eSATA Hardware Port Multiplier management utility for creating and managing RAID. Use this for Linux distributions.
5X1 eSATA Hardware Port Multiplier management utility for creating and managing RAID. Use this for Mac OS X.
5X1 eSATA Hardware Port Multiplier management utility for creating and managing RAID. Use this for Windows operating systems.