Sonnet has tested the following cards with the Drobo S:
Tempo SATA E2P..............................compatible
Tempo SATA E4P..............................not compatible
Tempo SATA ExpressCard/34...........compatible
Tempo SATA Edge ExpressCard/34...compatible
Tempo SATA Pro ExpressCard/34.....not compatible
Tempo SATA X4P..............................not compatible
Qio eSATA ports...............................not compatible
The first time you boot with the Qio connected, the screen will stay blue for up to 6 minutes while the Mac is configuring the Qio slot space. Please be patient. Subsequent boots should be normal. Note that you must install the Qio software before connecting the Qio.