I would like to know just how much disk space I will need for such a world in Minecraft. It will be stored on USB which has 3.12 GB of free storage remaining. This is for a Minecraft server. This world would be the size of normal Minecraft excluding the non-existent Far Lands.
Minecraft Java Edition – Data Requirements for a Large World
minecraft-java-editionminecraft-java-edition-server
Best Answer
Are you trying to build the Earth (it's actually about 22584607 by 22584607 metres surface area, about 3.2 times what you're asking about)? Well, the block height can take 256 values and each block uses at most ~2.5 bytes, so it's 12550824*12550824*256*2.5 = 100,814,837,170,544,640 bytes, aka 100,815,000 GB, aka 101 petabytes. You're going to need a bigger disk ;)
Compression could reduce this somewhat, but depends heavily on the complexity of the world. So unless your world is ultraflat it's probably still going to be a petabyte or more.