Hello.
Resident Apple Geek here.
I found the cable that came with my rockchip player was not up to snuff. It worked well enough with my work laptop, but my mIni? Nope. Nor did it like being plugged into an unpowered USB hub.
My first advice, then is to try it with a cable you know works with your Mac, preferably plugged straight into your computer. Also, my port is/was a bit loose (until I opened the thing and crimped the holder in a bit). I could start a transfer, then a slight touch could be enough to break the connection. So make sure it is connected and resting comfortable out of harm's way.
Can you copy off the device to the Mac? If so, do it (or do it to a PC) then use Disk Utility to format it. I did it with no ill effect, and mine worked like a charm after that under both OS.
If you are having issues still. Or if in the system profiler the device is not listed properly in the USB section, then you may want to do a quick Google for a developer's app called USB Prober. This will help identify exactly what the computer thinks is connected. But that's a last resort. Let's do everything else first. ;-)
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My two iPods are jealous of my two MPx players.
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