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Old 01-27-2018, 09:22 AM   #1
libertango
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Device: kobo clara hd, kobo glo hd, kobo aura h2o, kobo touch, kindle dx
Sometimes my Kobo is not recognized by windows

It is a somewhat erratic behavior. Sometimes I plug my Kobo in and Windows correctly recognizes it, I can explore directories and everything. Other times I get the "USB device not recognized" message.
My specifics: Kobo Glo HD, memory 2GB of 3.2GB, Nickel v.4.7.10413, Koreader v.2015.11, KSM 08, Windows 10, Calibre 3.16.0, Obok v.6.5.4.

As an example: today I plugged the Kobo in, and I could see it regularly, also inside Calibre, with all its content. After about half an hour with the device connected (no tasks), my Kobo suddendly disconnects. Calbre message is the following:
Spoiler:
calibre, version 3.16.0
ERRORE: Errore: Errore di comunicazione col dispositivo
IOError: disk I/O error
Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 87, in run
File "site-packages\calibre\gui2\device.py", line 510, in _books
File "site-packages\calibre\devices\kobo\driver.py", line 1859, in books
File "c:\t\t\apsw-9hooel\apsw-3.13.0-r1\src\cursor.c", line 236, in resetcursor
IOError: IOError: disk I/O error

At this point, in the "Device and Printer" section I see the Kobo as an Unknown USB device (Port reset failed).

After rebooting the PC Windows allowed me to connect my Kobo again, and requested the scanning and repairing of the unit, which I did successfully.

When the Kobo was connected I tested it with the Kobo Utilities plugin in Calibre (Check the device database) and the answer was:
Spoiler:
Result of running 'PRAGMA integrity_check' on database on the Kobo device: ok

Anyway I have only about 20 books in Nickel and about 3 times that in a different directory to be read with Koreader. So not an heavy database problem

I would prefer not to restore the unit. All suggestions are most welcome
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Old 01-27-2018, 11:38 AM   #2
PioXX
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Device: Sony PRS-600; Sony PRS-T1; Bookeen; Aura; Aura GLO HD; Aura ONE
I think it is not software Problem. It is, most probably, the poorly KOBO USB plug on the device. You must insert very carefully and do not touch the cable. Maybe try to change the USB cable. Another possibility is this plug connection here:
https://www.aliexpress.com/item/Del-...827405753.html

With me it has worked.
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Old 01-27-2018, 02:44 PM   #3
DNSB
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I would agree that it is unlikely to be a software problem. I do have a similar issue when I plug my KA1 into a USB 3 port on my laptop. The USB 2 port works as does a USB 2 hub plugged into the USB 3 port. Another possibility is the USB connecting cable. I've found multiple devices that are not happy with some of my collection of USB cables (device A works with cables B, D and E, device B works with cables A, C and E and device C works with cable B, C and D).
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Old 01-27-2018, 07:14 PM   #4
davidfor
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Quote:
Originally Posted by PioXX View Post
I think it is not software Problem. It is, most probably, the poorly KOBO USB plug on the device. You must insert very carefully and do not touch the cable. Maybe try to change the USB cable. Another possibility is this plug connection here:
https://www.aliexpress.com/item/Del-...827405753.html

With me it has worked.
For me, the problem is at the PC end. If I don't push it in straight, it doesn't connect properly, and if I bump it at the wrong time, I get the problem the OP is reporting.
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Old 05-12-2018, 07:05 PM   #5
mystika1
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I have had problems with the USB cables that I use. When I find one that works, I have to label it with tape. I currently only have one USB cable that works well with my ereader.

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