This is really a curiosity question: I've been messing about clearing up 
space on the eMMC after flashing a Debian image. After some modest 
housecleaning, I have about 384M available which just seems too little to 
me. Now I will be adding a microSD for storage but I was wondering if:

1) changing the filesystem blocksize on the eMMC was possible. Most NAND 
flashes have 512 byte pages versus the ext4 block size of 4K. I noticed 
while poking around that the reported usage for files and directories was 
much higher than than the actual size of the files. This could be from many 
small files - sounds like Linux libraries to me. Can you run mkfs on a live 
ext4 disk or do I need to do it offline? Also, can you change the block 
size after the fact and keep your data?

2) Is using bindings a good way to move directories off the eMMC and onto 
the uSD? What would be the best directories to move? /home for sure. /usr? 
/var? /opt?

Thanks in advance - learning this whole Linux thing and perusing the 
community information has been a great learning experience!

Ed

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