I'm running an external Mediasonic HF2-SU2S2 Probox for backup, I'm using the esata connection with this little guy, http://www.amazon.com/Adapter-Support-Multiplier-Patent-Pending/dp/B005DCCMII/ref=pd_sim_e_22, Datoptic esata to USB 3 adapter. It worked fine when I first installed July 2012 with the version of scanner available at that time, I only connect the unit about once a month, I just started having issues with one of my drives, and realized the smart data is no longer available.
I tried the fix here, http://wiki.covecube.com/StableBit_Scanner_Q8371232,
<setting name="UnsafeDirectIo" serializeAs="String"> <value>True</value>
no dice. any suggestions.
As a precaution, I reinstalled the USB 3 drivers for my motherboard, Asus, P8H67-I, and just updated to the latest BIOS. Also, Home Server Smart 2013 is able to pull the smart data, seems, I have two backup drives going bad.
Setup
WHS 2011
Scanner version 2.4.0.2929