ARC-1680ix series has compatibility issue between WD 6Gb/s SATA drives and LSI 3G SAS expander chip. This compatibility issue may result hard drive detection problem. We had contacted with WD to confirm this issue, and the only solution for this issue is to modify the SATA mode of this drive to 3Gb/s. WD has a software utility which allows you to modify the hard drive SATA mode. Please contact with WD for the utility to avoid this compatible issue.
Tags: ARC-1680ix, compatibility, drive, expander, HDD, SAS, SATA