Export Size

dunhill · 10-31-2025, 01:38 PM

Hello, when I export my Calibre library, it generates a bunch of files named `part-nnnn.calibre-data`, each 1.1GB in size.

Is there any way to tell Calibre to make these files a different size?

For example, 4.5GB.

Thanks

DNSB · 10-31-2025, 03:43 PM

I would say that increasing the maximum split file size is not a good idea. The limit on the split file size is to prevent issues with exceeding the maximum file size on different OS. Yes, most current disk formats can handle much larger file sizes. OTOH, FAT32 often used on removable disks is limited to 4GB.

theducks · 10-31-2025, 11:48 PM

That file size is probably a combination of legacy things:
OS file size limits is probably tops.
Remember Import/Export was designed to work across OS, not just on all OS.
This allows you to go from, say XP to Linux
We have evolved, but there ar folk that still use XP (and 32bit OS).

kovidgoyal · 11-01-2025, 12:53 AM

No there isnt. The file size is limited to 1GB for reasons of robustness across different platforms as others have already mentioned.

10-31-2025, 01:38 PM	#1
dunhill Guru Posts: 922 Karma: 810834 Join Date: Sep 2017 Location: Buenos Aires, Argentina Device: moon+ reader, kindle paperwhite	Export Size Hello, when I export my Calibre library, it generates a bunch of files named `part-nnnn.calibre-data`, each 1.1GB in size. Is there any way to tell Calibre to make these files a different size? For example, 4.5GB. Thanks

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10-31-2025, 03:43 PM	#2
DNSB Bibliophagist Posts: 48,182 Karma: 174315444 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos	I would say that increasing the maximum split file size is not a good idea. The limit on the split file size is to prevent issues with exceeding the maximum file size on different OS. Yes, most current disk formats can handle much larger file sizes. OTOH, FAT32 often used on removable disks is limited to 4GB.

10-31-2025, 11:48 PM	#3
theducks Well trained by Cats Posts: 31,269 Karma: 61916422 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	That file size is probably a combination of legacy things: OS file size limits is probably tops. Remember Import/Export was designed to work across OS, not just on all OS. This allows you to go from, say XP to Linux We have evolved, but there ar folk that still use XP (and 32bit OS).

11-01-2025, 12:53 AM	#4
kovidgoyal creator of calibre Posts: 45,609 Karma: 28549044 Join Date: Oct 2006 Location: Mumbai, India Device: Various	No there isnt. The file size is limited to 1GB for reasons of robustness across different platforms as others have already mentioned.