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Old 04-28-2010, 10:38 PM   #1
Davimee
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What is opf, and do I need to keep it?

I've been working on managing my library so when my reader comes in the mail tomorrow, I'll have everything set up on my SD card. I've made a bunch of books using Microsoft Word and saved them in rtf. Previously I just had a few of those (and the first several I made I used WordPad, if that makes any difference), and I just dragged and dropped them onto my reader with the USB. There was no opf file at that time. This past week I've made a whole bunch of rtf files and imported them into calibre. All I did in Calibre is give the books an author, tag, and series name. So tonight when I copied all the books onto my card, the folder is full of opf files, as well. Do I need these files, or can I delete them? I looked in the wiki, and saw that they contain the metadata for epub books, so I'm guessing it's the same thing... but since my other files didn't need them, can I just delete these, as well?

Thanks!
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Old 04-29-2010, 05:55 AM   #2
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Yes, you can delete them, and tell Calibre not to export them. They do, as you suggest, contain the metadata for the book, as well as a list of all the files that make up the book.
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Old 04-29-2010, 02:19 PM   #3
Davimee
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That answers my question, thank you! I will delete them for the rtf files, but keep them for epub. Thanks!
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Old 04-30-2010, 02:20 AM   #4
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If you use Save to Disk instead of Send to Device, Calibre will only send the book and not the associated files (jpg if you have a cover, opf etc.) You can delete the opf files off of your reader, but you shouldn't be adding or deleting anything directly to your Calibre library folder. You can really confuse the Calibre database if you don't let it manage those files.
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Old 04-30-2010, 12:43 PM   #5
Davimee
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Thanks, Polly. I have been using Save to Disk, but it still loads the opf file. But I found the option to uncheck, so it no longer adds those to the card. And as to changing anything in Calibre, I wouldn't have a clue how to do that anyway, so I just leave it alone.
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