The things are actually bidirectional, so could be used the other way around assuming you could physically connect them. They use a Sunplus SPIF-223A sata bridge chip, and work very well on almost every machine I have tried them with.
FWIW I got a similar thing for my VIA EPIA PD (8235/82C586): a pair of SPIF-223A chips on a little board which plugs into the motherboard PATA connector and provides two SATA connectors on for connecting the drives -- and it plain didn't work.
It's possible I just got a faulty one, but while the BIOS would correctly list the attached device, it always hung solid trying to boot off it, and if I booted Linux off real PATA, the connection to the SATA disk would just be lost interrupts and CRC failures left, right and centre.
The disk was fine on a USB-to-SATA dongle, and I eventually solved the problem by ditching the system's PCI DVB card in favour of a USB DVB tuner I already had (and which anyway had better reception), and getting a very cheap Silicon Image PCI SATA card, which has worked flawlessly ever since.
Which is maybe not very helpful, especially as your Shuttle is presumably Nvidia MCP IDE, not VIA IDE, but I just thought I'd share some SPIF-223A scepticism.
Peter
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