Ive got an OWC Thunderbay 2 and an OWC Thunderbay Mini hooked to my 5K iMac, both with SoftRAID arrays running in them. I keep the Mini on all the time, but the big one is for bulk storage that I dont use often, so I usually keep it powered off to reduce noise, power use, and maybe wear on the drives. Thats fine--SoftRAID volumes eject just like any others. Problem: Every time I power off or disconnect the Thunderbay 2, my iMac immediately kernel panics. The drives have been properly ejected, but the OS goes down hard anyway. If Im reading the panic logs correctly, its not SoftRAID thats causing the problem; it appears to be the Thunderbolt to SATA controller in the Thunderbay: Code: Kernel Extensions in backtrace: com.apple.driver.AppleAHCIPort(3.1)[93E1D2EC-50EE-3340-9676-0EA1E0B1AD45]@0xffffff7f929ed000->0xffffff7f92a07fff dependency: com.apple.iokit.IOAHCIFamily(2.7.5)[DAF0353B-16D5-385A-A0F3-FD5CF3BA07F2]@0xffffff7f9185f000 dependency: com.apple.iokit.IOPCIFamily(2.9)[56AD16B5-4F29-3F74-93E7-D492B3966DE2]@0xffffff7f90d26000 Can anybody else with a Thunderbay help out with whether this is happening to you as well, or if powering off the connected device works as expected? Im going to get ahold of OWC support next week, but Im curious if this is a widespread issue or specific to my system.