Calibre Export Backup

Quoth · 04-20-2024, 06:20 PM

Part 1 is 26.3 M Byte
Most parts except the last are about 1G Byte
The last is less than 1G byte.

Part-0002.calibre-data is 12.4 GByte. Copying that to Linux Server HDD is not a problem (ext4). Copying it to a USB stick via LAN seems to get connection timeout at about 4.3 G Byte. Direct export to that USB stick also failed.

Because the USB stick is FAT, a file can't be more than 4G byte at the power of two, 4 GiB minus one byte, or 4 294 967 295 bytes, hence fails at 4.3 G.

Calibre 7.8 on Linux Mint 21.3 x86-64

Not sure why part2 is so much bigger unless it's the FTS database in one piece?

FAT32 is common for interchange betwen different OS.

kovidgoyal · 04-20-2024, 10:52 PM

Yes, it will be the FTS database, the infrastructure doesnt support splitting up single files into multiple pieces, as it was written before there was FTS and hence no individual files were large. Use exfat these days rather than fat and you will be fine.

kovidgoyal · 04-21-2024, 10:52 AM

https://github.com/kovidgoyal/calibr...59b033beaeb8a7

Quoth · 04-21-2024, 05:18 PM

Quote:

Originally Posted by kovidgoyal

Use exfat these days rather than fat and you will be fine.

I'll have to see does the mad box that the USB stick (128G) is for supports exFAT. It's plausible that it doesn't but that ext4 works!

Thanks

Quoth · 04-21-2024, 05:19 PM

Quote:

Note that this means that exports created by calibre from this version
on will not be importable by earlier versions. However, exports from
earlier versions should still be importable.

That's good to know!

04-20-2024, 06:20 PM	#1
Quoth the rook, bossing Never. Posts: 11,221 Karma: 85874891 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper11	Calibre Export Backup Part 1 is 26.3 M Byte Most parts except the last are about 1G Byte The last is less than 1G byte. Part-0002.calibre-data is 12.4 GByte. Copying that to Linux Server HDD is not a problem (ext4). Copying it to a USB stick via LAN seems to get connection timeout at about 4.3 G Byte. Direct export to that USB stick also failed. Because the USB stick is FAT, a file can't be more than 4G byte at the power of two, 4 GiB minus one byte, or 4 294 967 295 bytes, hence fails at 4.3 G. Calibre 7.8 on Linux Mint 21.3 x86-64 Not sure why part2 is so much bigger unless it's the FTS database in one piece? FAT32 is common for interchange betwen different OS.

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04-20-2024, 10:52 PM	#2
kovidgoyal creator of calibre Posts: 43,904 Karma: 22666668 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Yes, it will be the FTS database, the infrastructure doesnt support splitting up single files into multiple pieces, as it was written before there was FTS and hence no individual files were large. Use exfat these days rather than fat and you will be fine.

04-21-2024, 10:52 AM	#3
kovidgoyal creator of calibre Posts: 43,904 Karma: 22666668 Join Date: Oct 2006 Location: Mumbai, India Device: Various	https://github.com/kovidgoyal/calibr...59b033beaeb8a7