FirmTek ( has announced that the
SeriTek/2SE2-E SeriTek/2SM2 storage adapters are fully Mac OS X
10.6.x (“Snow Leopard”) compatible.

FirmTek also offers the SeriTek/2SE2-E PCI-Express eSATA host
adapter, which is compatible with all Mac Pro models and the late
2005 PowerMac G5 (11,2). This 2-port SATA II controller enables
Macintosh PCI-Express equipped desktop owners to add external,
native, eSATA ports to their computer. With the release of the new
FirmTek 5.4.x driver the SeriTek/2SE2-E is fully Snow Leopard
compatible with the Mac Pro.

The new series 5.4.x FirmTek driver is built from the ground up to
take advantage of Snow Leopard. It adds SMART application support and
full 32-bit or 64-bit “Snow Leopard” compatibility. However, it will
only recognize FirmTek controllers.