frostschutz, I think I might've posted this in the wrong place, so I'll quote the visitor message which I can't seem to delete (sorry, I made an account just to ask about this):
"I downloaded the entire English epub collection from Project Gutenberg, and was hoping to put it as well as a Wikipedia ZIM file using a pre-4.0 OS (as mentioned here
https://www.mobileread.com/forums/sh...d.php?t=276219) on a 128GB external card in my H2O (I was able to find an older ZIM file of the ebook collection, but searching it like an offline Wikipedia isn't really practical as it doesn't remember its place in books or list them).
Using FAT32 the card can't handle that many files, so I discovered your hack to modify the filesystem, but then the sqlite file (I guess for indexing the books) on the internal card filled up the entire internal card. Presumably this is because there are too many files/books (I read someone had tried it with 10,000 or so, and that was already over 800 megabytes, while the Project Gutenberg collection is over 44,000 books). Without taking the H2O apart, it seems the only solution is to clone the internal card to the external one (perhaps using your magic memory hack) and somehow boot the stock OS from the external card expanding the data partition to fill the entire card.
Is this doable? Or is there another solution to the sqlite file becoming too large without taking the H2O apart and breaking the seal?"