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Old 04-19-2016, 10:48 PM   #6
kovidgoyal
creator of calibre
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Posts: 45,590
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Location: Mumbai, India
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According to that debug output, the USB sub-system on your Mac is flaking out. Querying it for USB disks seems to be failing, sporadically. I dont see anything calibre can do about that, I'm afraid.
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