Expanding internal µSD storage to ext4?

CH23 · 05-19-2017, 03:56 PM

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.

frostschutz · 05-19-2017, 06:12 PM

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.

rashkae · 05-19-2017, 11:30 PM

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.

frostschutz · 05-20-2017, 04:35 AM

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.

05-19-2017, 03:56 PM	#1
CH23 Bottom Text Posts: 146 Karma: 332882 Join Date: Nov 2016 Device: Kobo Clara HD, Kobo Glo HD	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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Replacing Internal Storage?	Rbneader	Kindle Developer's Corner	18	08-17-2015 08:53 PM
question about app storage and internal storage	gilly78201	Kindle Fire	5	03-06-2012 02:08 AM
PRS-600 Internal and SD Card storage	garyasta	Sony Reader	2	01-05-2012 02:31 PM
Internal storage is very low, help please	rushkk	enTourage Archive	9	09-02-2010 01:54 PM
Accessing internal and SD Storage	ramjet1953	OpenInkpot	2	02-16-2010 10:51 AM

05-19-2017, 06:12 PM	#2
frostschutz Linux User Posts: 2,282 Karma: 6123806 Join Date: Sep 2010 Location: Heidelberg, Germany Device: none	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.

05-19-2017, 11:30 PM	#3
rashkae Wizard Posts: 1,269 Karma: 5935030 Join Date: Jun 2011 Location: Ontario, Canada Device: Kobo Aura HD	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.

05-20-2017, 04:35 AM	#4
frostschutz Linux User Posts: 2,282 Karma: 6123806 Join Date: Sep 2010 Location: Heidelberg, Germany Device: none	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.

Advert