MTP connection issues

[aramaziakin]

As far as I can tell Calibre keeps creating files (driveinfo.calibre and metadata.calibre) that it then can't read which causes connection issues.
So I have Calibre send my books to a folder called 'Books' on an sd card in my android device, that works fine. But then for some reason Calibre keeps creating a folder called 'Document' on both the sd card and internal storage and creates the 2 files I mention before. If I don't delete these new folders Calibre throws up a connection error when I connect my device. Calibre is fine with the driveinfo and metadata files in the 'Books' folder, it is only with the ones it creates in these 'Document' folders that causes connection issues.
Is there any way to stop Calibre creating these files, or anyway to fix the files so they don't cause connection issues?

[theducks]

Those 2 files are the log of what Calibre has previously found ON THAT Drive. They are in the root of the drive regardless of where the books are.

The SD card is also a drive, so they should be there also

If they are missing, then Calibre has to rescan the whole drive(s) as the 'what is known' shortcut is missing.

MTP is iffy in some cases. One thing: Only have 1 MTP device connected at a time.
This FAQ may help (a tiny bit) https://manual.calibre-ebook.com/faq...or-kindle-fire

[kovidgoyal]

If calibre cant read files it has created previously, that indicates there are firmware issues on your device. A reboot might help, if not a reset and if that doesnt help either, then you can use one of the wireless conenction methods instead.

[aramaziakin]

Originally Posted by kovidgoyal

If calibre cant read files it has created previously, that indicates there are firmware issues on your device. A reboot might help, if not a reset and if that doesnt help either, then you can use one of the wireless conenction methods instead.

I've not had much luck with the wireless options and rebooting everything hasn't worked, is there any of figuring out what's actually going wrong here?

[theducks]

Without Calibre running (involved), can you use Windows to copy a bunch of files to a Test folder (so it is easy to clean up after the test)?
If that fails, then there may be storage integrity issues (With my devices, I still have file transfer mod, so Windows can check the drive. With MTP, I have no clue how to get that done)

[theducks]

Found something
NOT TESTED or endorsed

https://www.auslogics.com/en/article...ed-windows-10/

[kovidgoyal]

Originally Posted by aramaziakin

I've not had much luck with the wireless options and rebooting everything hasn't worked, is there any of figuring out what's actually going wrong here?

What's going wrong is calibre is making a request to the MTP subsytem on windows to do file i/o and that request is failing. This happens on some devices with flaky firmware for files that are frequently updated such as those two. If you don't want to try reset then basically deleting those two files prior to connection is the best workaround.

[aramaziakin]

Well the wireless connection suddenly started working again and in a pinch I can just take out the SD card and connect it to my computer, so I think I'll just not use mtp since it's buggy.
Thanks for the help guys.

[Ealdwulf]

Hrmm, I started experiencing an issue with transferring books to my Nook Tablet around a week ago, while it worked without issue, for many years before that. The error was also with transferring metadata.

I tried deleting the two files in the root of the Nook storage and still got the error when transferring. Further testing on my end, revealed that if I use 7.13.0 I get NO errors, but 7.14.0 does give errors.

I ended uo filing a bug report just now for this situation, #2073546. Whether this is also the reason that aramaziakin is also having the error or not, I couldn't say for certain since I have no knowledge on what version they are experiencing the problem with (or even if it is the same problem), but I wanted to at least mention it and suggest maybe trying to rollback the version of Calibre being used for testing purposes. Especially if something new that didn't happen previously.

[sushigal007]

Been looking for a solution to this problem myself for the past couple of days after getting it suddenly after years with no problems, and rolling back to 7.13.0 worked for me, many thanks.