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Old 09-19-2023, 06:01 AM   #1
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Transfer EPUB files
Hi,
I would just like to ask a question. Excuse me if it has already been answered.
When I transfer an EPUB book from calibre to my ebook reader, three files are displayed: the epub file, the cover in jpg format and a .opf file. Are all these files necessary? I usually delete the jpg and opf files and all seem to be ok; there is no problem with the book.

Thank you!
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Old 09-19-2023, 06:18 AM   #2
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Which ebook reader?
Where are the 3 files displayed - in Calibre or the ebook reader?
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Old 09-19-2023, 06:19 AM   #3
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Mostly NO.
OTOH this may be a device dependency. Some do. Some don't.

Preferences:Saving to Disk: remove the ticks for separate cover and separate OPF and see if your device still displays the book correctly.

But why are you using Save to Disk instead of Save to Device?
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Old 09-19-2023, 06:25 AM   #4
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Thank you for your answers.

Actually I just use calibre for such work, not as a library. I save all my ebooks in an external disk or in a SDcard, which I use with my ebook reader (Pocketbook), as I do not always have my ebook reader with me.
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Old 09-19-2023, 12:59 PM   #5
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Why use Calibre then?
The OS can copy files to another location (a connected device).
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Old 09-20-2023, 05:35 AM   #6
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I use it for conversions and edits.
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Old 09-20-2023, 09:57 AM   #7
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Quote:
Originally Posted by ichnilatis View Post
Hi,
I would just like to ask a question. Excuse me if it has already been answered.
When I transfer an EPUB book from calibre to my ebook reader, three files are displayed: the epub file, the cover in jpg format and a .opf file. Are all these files necessary? I usually delete the jpg and opf files and all seem to be ok; there is no problem with the book.

Thank you!
You are doing it all wrong.

You run calibre and select the library you want. Then you plug your Reader into the USB port. Once calibre has recognized your reader, select the eBooks you want to send to your Reader. Then right click and from the menu, select Send to device and then Main memory. That's it done.

DO NOT go to the library and copy the files from it to your Reader. That's what's wrong.
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Old 09-20-2023, 10:31 AM   #8
ichnilatis
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Thank you for your instructions, but I do not copy the files directly to my e-reader; I copy them to an SD card.
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Old 09-20-2023, 12:50 PM   #9
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Quote:
Originally Posted by ichnilatis View Post
Thank you for your instructions, but I do not copy the files directly to my e-reader; I copy them to an SD card.
Again, do not go into the library.
Use Calibre to either send-to device, or Save-to-disk in this case,
Do not touch the library with anything but Calibre.
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Old 09-20-2023, 05:40 PM   #10
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Quote:
Originally Posted by ichnilatis View Post
Hi,
I would just like to ask a question. Excuse me if it has already been answered.
When I transfer an EPUB book from calibre to my ebook reader, three files are displayed: the epub file, the cover in jpg format and a .opf file. Are all these files necessary? I usually delete the jpg and opf files and all seem to be ok; there is no problem with the book.
If you use the Save to Disk feature, which I would recommend in your usage case, you can control what gets saved via the Preferences->Save to Disk settings:

Click image for larger version Name: Screenshot 2023-09-21 063451.jpg Views: 34 Size: 227.4 KB ID: 203899

BR
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Old 09-20-2023, 06:26 PM   #11
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Quote:
Originally Posted by ichnilatis View Post
Thank you for your instructions, but I do not copy the files directly to my e-reader; I copy them to an SD card.
You could use the "folder device" to do this, which would permit calibre to tell you which books on the SD card are in the calibre library.
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Old 09-20-2023, 08:47 PM   #12
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Quote:
Originally Posted by ichnilatis View Post
Thank you for your instructions, but I do not copy the files directly to my e-reader; I copy them to an SD card.
Put the SD card in your Reader, plug your Reader into the USB with your library up and running, and Send to device using calibre.
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Old 09-21-2023, 08:59 AM   #13
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Originally Posted by BetterRed View Post
If you use the Save to Disk feature, which I would recommend in your usage case, you can control what gets saved via the Preferences->Save to Disk settings:

Attachment 203899

BR
Thank you for your instructions. They are really helpful and solve my problem.
The fact is that, for some reasons, I do not always have my e-reader with me and I use the SDcard as a transfer means.
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Old 09-21-2023, 05:18 PM   #14
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Quote:
Originally Posted by ichnilatis View Post
Thank you for your instructions. They are really helpful and solve my problem.
The fact is that, for some reasons, I do not always have my e-reader with me and I use the SDcard as a transfer means.
Send to device when you have your Reader with you and Save to disk for when you don't.
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