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Old 12-22-2020, 09:58 AM   #1
mst
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Subset of books that were sent to device are not recognized as "on device"
I have a library of roughly 2,000 epubs in Calibre. When I send them to my Kobo Clara HD, they show up in Calibre as "on device", and after unplugging on KOReader, I can browse all of them by Calibre metadata.

When I re-connect my device to the computer via USB, something strange happens: Calibre refreshes the metadata file metadata.calibre, its size gets smaller, and about 150 out of these 2,000 epubs now have the "on device" mark unchecked even though they are on the memory of the reader and showed up perfectly fine as "on device" right after sending them the last time. After disconnecting the device from USB, the tags of these missing files are now also missing on KOReader. When I reconnect and send the missing books to the device again, they show up "on device" and their tags are back in KOReader, but only until the next time I connect to Calibre.

I polished all these missing books (again) in Calibre and keep re-sending them, but the problem persists. Has anybody made a similar experience and found a workaround? Or did I overlook some setting either in KOReader or in Calibre?
Last edited by mst; 12-22-2020 at 11:49 AM.
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Old 12-22-2020, 11:48 AM   #2
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Do you ever allow nickle to process content on your Kobo? I believe some of the functions of the Kobo calibre integration depend on reading the database on the Kobo which is maintained by nickle.
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Old 12-22-2020, 12:12 PM   #3
mst
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Originally Posted by PeterT View Post
Do you ever allow nickle to process content on your Kobo? I believe some of the functions of the Kobo calibre integration depend on reading the database on the Kobo which is maintained by nickle.
Thank you, Peter, that was it.

In case anybody has the same issue, my workaround is exiting KOReader before connecting on USB and putting new books on it and letting Nickel update the database on disconnect.
Last edited by mst; 12-22-2020 at 04:54 PM.
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Old 12-22-2020, 09:31 PM   #4
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Originally Posted by mst View Post
In case anybody has the same issue, my workaround is exiting KOReader before connecting on USB and putting new books on it and letting Nickel update the database on disconnect.
If you are not going to use nickel, then my recommendation is to not use the KoboTouch or the KoboTouchExtended drivers. There is no function the drivers supplies that benefits you when not using nickel. Plus, they reads the database to see what is on the device. As you have discovered, if you don't go into nickel after sending books to the device calibre will not see them.

Instead you can use either the Folder Device Interface or the User Defined USB driver. Both will supply the basic function for sending books to the device and seeing that they are connected later. They will also build the metadata.calibre file the KOReader uses.

The Folder Device Interface treats a folder as a device. In this case use a folder on the connected device. Using the root directory should work.

The User Defined USB driver can use any connected USBMSD device. For the Clara HD, You need to configure this driver with:

USB Vendor ID: 0x2237
USB Product ID: 0x4232
USB Revision ID: 0x401

For both, you will also need to disable to the KoboTouch or the KoboTouchExtended drivers.
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Old 12-23-2020, 09:59 AM   #5
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Originally Posted by davidfor View Post
Use either the Folder Device Interface or the User Defined USB driver. The User Defined USB driver can use any connected USBMSD device. For the Clara HD, You need to configure this driver with:

USB Vendor ID: 0x2237
USB Product ID: 0x4232
USB Revision ID: 0x401

For both, you will also need to disable to the KoboTouch or the KoboTouchExtended drivers.
Thank you!

I disabled the Kobo Touch driver and can exchange data via the Folder Device Interface, which works fine.

As expected, disabling the Kobo Touch driver puts the Kobo eReader in the list of disabled device drivers in the Calibre preferences. Is that why the Kobo Clara HD only works by clicking "connect" and using the Folder Device Interface? This is now the only way for me to mount the device in Calibre.

Or is there a way to switch between the Folder Device Interface and the User Defined USB Driver or enable the User Defined USB Driver? I used the parameters above but the device fails to mount automatically when I connect via USB.
Last edited by mst; 12-23-2020 at 04:50 PM.
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Old 12-24-2020, 12:35 AM   #6
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Quote:
Originally Posted by mst View Post
Thank you!

I disabled the Kobo Touch driver and can exchange data via the Folder Device Interface, which works fine.

As expected, disabling the Kobo Touch driver puts the Kobo eReader in the list of disabled device drivers in the Calibre preferences. Is that why the Kobo Clara HD only works by clicking "connect" and using the Folder Device Interface? This is now the only way for me to mount the device in Calibre.
That is expected. Disabling the KoboTouch driver means that calibre is not looking for the device and will not do anything when it is connected. The Folder Device Interface needs to be setup and started when you want to use the folder as a device. I think there is a way to have it connect automatically, but, beyond some basic testing, I don't use it.
Quote:
Or is there a way to switch between the Folder Device Interface and the User Defined USB Driver or enable the User Defined USB Driver? I used the parameters above but the device fails to mount automatically when I connect via USB.
My apologies, it's been a while since I tested this, and I copied the wrong product ID. The product ID I gave you above is from the Libra H2O. The correct values for the Clara HD (and I tested this time) are:

USB Vendor ID: 0x2237
USB Product ID: 0x4228
USB Revision ID: 0x401
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Old 12-27-2020, 06:44 AM   #7
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Thank you, Peter.

With the User Defined USB Driver, should the device automatically mount like with the Kobo Touch driver?
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Old 12-27-2020, 08:45 AM   #8
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Quote:
Originally Posted by mst View Post
With the User Defined USB Driver, should the device automatically mount like with the Kobo Touch driver?
Yes. Assuming it is configured correctly.
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