Calibre compatible collections

[emanuensis]

"thanks" (imagine a moving gif: )Well laid out and with lots of options! Although i will have to explore to see if hierarchical relations are possible (eg do not include .mobi IFF there exists a format such as .epub)

[eschwartz]

The second right-click option: Add books from directories, including sub-directories (One book per directory, assumes every ebook file is the same book in a different format)

I always assumed was specifically there to rebuild a Saved To Disk calibre library. After all, it is not recommended to use the same metadata.db on both windows and linux, so this is the only way to safely share a library between the two.

I can confirm that if you use this option, it reads all the metadata from calibre's generated metadata.opf during the Save To Disk. (Or even if you need to build from the actual library used on a different OS. I tried using the library folder of a Ubuntu installation on a Windows computer once but couldn't link to half my ebook files until I rebuilt from the library folder into a new library.)

[eschwartz]

Originally Posted by emanuensis

Well laid out and with lots of options! Although i will have to explore to see if hierarchical relations are possible (eg do not include .mobi IFF there exists a format such as .epub)

If you saved them from calibre then it will be in the same folder as the same book in two formats, and re-added as such. If you had them listed separately, it will add them separately, but ask to confirm if you want to add "duplicates"

[emanuensis]

The mobi format can take 3 or 4 times as many bytes as the epub format. And i am sure there are others examples as well. If one has a epub version and it has all the qualities of the mobi why not get rid of the mobi? (only create it as needed for export to mobi only devices). That would save a lot of space. i would guess that there are many such inequalities, this is only the most prominent.

There seems to be no provision in Calibre for deleting mobi IFF there is a epub. One can only delete mobi's - and that my be the only copy! Perhaps one can massively produce epub's, then delete mobi's?

greg

[PeterT]

See this technique for easy finding of books that have both epub and mobi formats:

Originally Posted by PeterT

Try this:

Search for

formats:"epub" and formats:"mobi"

then ensure that the third icon besides the search bar shows 3 blue lines with a red diagonal (this is the toggle button for Search Highlighting).

Now the library list should only contain the subset of books in your library that have both ePub and mobi formats.

Select the whole displayed list and then right click, and select Remove Books and then select the option Remove books of a specific format from selected books an finally select the ePub option from the dialog.

In your case you would then want to remove the MOBI format and not the EPUB