I had this error last night, without calibre. Did nothing wrong or out of the ordinary as far as I know, just out of the blue after transfering over a single file via explorer drag and drop, then using Windows "safely eject hardware" like I've done dozens of times before.
What a piss-off. Not only did I have to reset the device which took 1/2 hour, but then reload all of my side load content (~100 books, manually drag and drop via explorer), another 1/2 hour, only to find it didn't recognize 1/3 of it, and had to do it over in smaller blocks of 25 files, took 1 hour.
Then I found it lost my entire reading history (# of hours read in total< # of books complete, etc). Even though it told me in the Kobo desktop "Don't worry, all of your books and Reading Life will be saved and restored once you preform the reset"
That is a load of crap, everything was lost.
Like I said, a major piss-off.
I've used various USB music players over the years (sony, sandisk, ipod), and I've used several Blackberries over the years too via USB, as a document storage device, for music, pictures and ebooks via mobi-pocket reader. I've beat those devices to HELL with USB abuse over the years, sometimes unplugging them in the middle of a transfer and *NEVER* has any one of those half dozen devices *EVER* lost all of the files or corrupted the memory requiring a factory reset. *NEVER*
But the Kobo seems to be so flakey there's no rhyme or reason to it.
DEVELOPERS - you need to get this fixed NOW.
Stop work on *everything* else, and make it *BULLETPROOF*.
This should NEVER happen to a device like this. PERIOD. You obviously have a core problem right at the OS level that needs to be addressed.
I have about 1 week left on my 30 day return period, and am likely going to get a refund unless I hear this issue is taking the undivided attention of the developers and they are going to eradicate it forever.
Like I said, no other USB device I've ever used has suffered from a similar problem.
Cheers
The REAL Joe
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