The HPM XA can be had in system versions that plugs into a PCI slot in your computer chassis or an enclosure version for connecting to SCSI enclosures and other enclosure types. Both of the versions have the same hardware capabilities.
The port multipliers can turn one SATA port into five ports that can support both optical and storage drives. The port replicators can also support RAID arrays and have an integrated buzzer to warn when there is a RAID error. The device sells for $99 in either version and works with Windows, Linux, and Mac systems.