The website http://www.ironkey.com/ states that the system is compatible with Mac OS 10.6+. That is not right. I've connected it to both Yosemite 10.10 and El Capitan 10.11 systems. In both operating systems the hard disk is not mounted. When plugged in, the red light comes on, the yellow light comes on, the drive clicks, then the yellow light goes off and it just sits there. I wrote to Imation Mobile Security Technical Support and said the following: We are currently testing MAC Yosemite (10.10) and El Capitan (10.11). We are aware that some customers are having issues with these versions. We intend to support these releases; However, it is currently being checked for official support for these versions. I have registered this device and its symptoms with our engineering team. See error 21922. In the meantime, you can use the H300 in a native Windows environment or try using the device on another Mac system with a version other than v10.10. x or v10.11.x. Best regards, Pua VangIronKey from Imation Mobile Security Technical Support
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