2 Devices With 32GB Storage But...

[93terp]

I have 2 Kobo devices with 32GB onboard storage (no SD card), a Kobo Aura One LE and a Kobo Forma. I have exactly the same books loaded on both devices, both using the kepub format (6,557 books). Additionally, both devices are running the same FW (4.23.15548) and the exact same patches. Finally, the database file (koboreader.squlite) on each device is basically the same size (804MB).

However, the remaining device storage is wildly different between the 2 devices. The Forma shows 17.6GB remaining, but the Aura One LE shows 19.3GB remaining.

Any idea why there's a significant difference in remaining storage for these devices?

[NiMa]

Your Forma may have had more updates than your Aura, and this may have lead to unnecessary files left in the rootfs partition during updates.
I say that just because it's the only possible cause I can see... Is it true? Well, I don't know, but what I know is that during updates, the KoboRoot.tgz is extracted to the rootfs partition, without completely wiping the previous update, just replacing old files by new files if there's an update.

Hope you'll resolve your problem!

[hobnail]

Yesterday I was poking around and noticed that I have a lot of empty author folders on my kobo. I wouldn't think that empty folders would take up much space but what do I know.

An interesting experiment would be to do a factory reset (Settings -> Device Information) on the Forma and then reload the books. The firmware will stay the same.

[John F]

A WAG, maybe different size image thumbnails?

[93terp]

Originally Posted by hobnail

Yesterday I was poking around and noticed that I have a lot of empty author folders on my kobo. I wouldn't think that empty folders would take up much space but what do I know.

An interesting experiment would be to do a factory reset (Settings -> Device Information) on the Forma and then reload the books. The firmware will stay the same.

I did just recently factory reset my Forma after a hiccup with updating the prior FW, and that reload resulted in exactly the same onboard storage remaining after the reset. This reload was only 10 days ago, so I'm thinking it's not that...

[93terp]

Originally Posted by John F

A WAG, maybe different size image thumbnails?

How would that happen? I'm using the same files during the Calibre sideload to both devices.

[geek1011]

Originally Posted by 93terp

How would that happen? I'm using the same files during the Calibre sideload to both devices.

By default, thumbnails are generated as you scroll through the library.

[DNSB]

Try looking at the size of the .kobo and ,kobo-images directories on both devices.

[93terp]

Originally Posted by DNSB

Try looking at the size of the .kobo and ,kobo-images directories on both devices.

Kobo Forma
.kobo is 794MB
.kobo-images is 2.4GB


Kobo Aura ONE LE
.kobo is 797MB
.kobo-images is 682MB

I guess the .kobo-images folder is where the issue lies. Does this have to do with the apparent fact that I have scrolled less through the library on my Aura ONE LE than that done on the Forma?

[geek1011]

Originally Posted by 93terp

Kobo Forma
.kobo is 794MB
.kobo-images is 2.4GB


Kobo Aura ONE LE
.kobo is 797MB
.kobo-images is 682MB

I guess the .kobo-images folder is where the issue lies. Does this have to do with the apparent fact that I have scrolled less through the library on my Aura ONE LE than that done on the Forma?

Yes. If you want, you can pregenerate covers with covergen (part of kepubify), then possibly use something like jpegoptim to reduce the size further.

[93terp]

Originally Posted by 93terp

Kobo Forma
.kobo is 794MB
.kobo-images is 2.4GB


Kobo Aura ONE LE
.kobo is 797MB
.kobo-images is 682MB

I guess the .kobo-images folder is where the issue lies. Does this have to do with the apparent fact that I have scrolled less through the library on my Aura ONE LE than that done on the Forma?

I scrolled through every page of My Books to load all the thumbnails on my Aura ONE LE, and results are -

Kobo Aura ONE LE
.kobo is 797MB
.kobo-images is 1.9GB
Free space - 18.1GB

[HLS]

Forma is more high end so I am guessing there is more to its software than we are aware of

[geek1011]

Originally Posted by HLS

Forma is more high end so I am guessing there is more to its software than we are aware of

No, there isn't.

[davidfor]

Originally Posted by HLS

Forma is more high end so I am guessing there is more to its software than we are aware of

The resolution of the Forma is higher. The full screen cover image is larger than the on the Aura ONE (either edition). That would account for the difference.

From memory, Kobo have put other images in the .kobo-images directory at times. These have been different for different devices. I don't know if there is anything at this point.

[93terp]

Originally Posted by davidfor

The resolution of the Forma is higher. The full screen cover image is larger than the on the Aura ONE (either edition). That would account for the difference.

Thanks.

One other weird/interesting observation between these 2 devices - on the Forma, every single book on my device had the image already loaded (i.e., it didn't have any generic placeholder covers that had to be updated with the loaded image). However, on the Aura ONE LE, when scrolling through My Books, images were not automatically available if that book's author/collection/series/book had not previously been viewed.