Hey ronbo613 (and others)
YES - U - CAN use the port multiplier capability of the GA-P55A-UD4P motherboard.
It uses the Jmicron JMB632 PCI express to x2 SATA 2 host controller
(on the motherboard and 2 eSATA ports are available on back connectors)
(be sure to enable AHCI in the BIOS for these eSATA ports)
and as it states on the Jmicron webpage here:
http://www.jmicron.com/JMB362.html• Supports Hot Plugging like USB on SATA II port
• Supports Port Multiplier with Command-based Switching on SATA II port
I updated my driver to JMB36X_WinDrv_R1.17.63_WHQL_eSATA.zip
available here:
ftp://driver.jmicron.com.tw/SATA_Controller/Windows/i know this post is over 90 days since anyone posted
but i did finally get mine working and wanted to share the info
I use the Thermaltake BlacX duet docking station pictured here:
http://thermaltakeusa.com/Product.aspx?C=1346&ID=1895#Tab0and yes it recognizes BOTH drives AND hot pluggable = yummy !
I am using this on my WIN 7 Pro 64 bit machine
hope this helps those searching