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Old 05-19-2017, 03:56 PM   #1
CH23
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Expanding internal µSD storage to ext4?

I'm trying to upgrade my Kobo Glo HDs internal memory, and I would like to use EXT4 instead of FAT32

I have KSM08, and the latest release of KOReader on it.

But going through the filesystem, I have no idea where this is defined, and if I could add or change it without repercussion?
fstab doesn't seem to be used.

I'm sure there's some koboupdate mod that would do this for me but i'm more interested in understanding than ease.
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Old 05-19-2017, 06:12 PM   #2
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My approach was to wrap the mount binary itself. If mount is called with -t vfat and the mount fails, it will fall back to -t auto instead. You can see it here https://github.com/frostschutz/Kobo/...fat/sbin/mount

As for the mount, it's called by various scripts, and nickel itself.

I'm not actually using this hack myself. It might do more harm than good - nickel used lazy umounts (which don't umount at all, if the filesystem is still in use)... ext4 might not take it well.
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Old 05-19-2017, 11:30 PM   #3
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I would be more concerned with the ext4 journal drilling a hole in the SD card.. they don't exactly have the greatest wear leveling.

Edit: On the other hand, since you're replacing your own, I suppose durability doesn't really matter.
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Old 05-20-2017, 04:35 AM   #4
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It's already using ext4 for the system partition. Granted, that's not written to often (only when you update or change your wifi settings or ...).

If you're really concerned about that you can just go with ext2.
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