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"Thermaltake 5G Duet" keeps disconnecting on Mac OS X, with the latest Yosemite. “Disk Not Ejected Properly†is usual message. It happens suddenly with no special reason. I might copy something or do nothing at all. It may take 2 minutes, it may take 10 minutes till disconnection. HDD are 3 Samsung drives from 2008. Working fine in the PC. Drives ar NTFS, and Mac OS Extended (Journaled) I have tried: - unchecking “put drives in sleep when possible†in Energy saving - downloaded some wierd JMicron firmware update utility, which did nothing and is disabled on start, no matter do I add additional drives or leave enclosure empty. - tried different drives in different combinations. - read lots of forums on the internet about the problem, which is not unique for me, no help. I am an IT professional, so your answer may get as technical as it needs to be. Also, what similar product you would recommend, which worked on Mac OS, because I am about give up on this one? Thank you.