I'm not an expert on this, but each file occupies a minimum area on the disk, called a block. Now depending on the block size and the number of files, it's easy

I'm not an expert on this, but each file occupies a minimum area on the disk, called a block. Now depending on the block size and the number of files, it's easy for 300KB of data to occupy 60MB space on the disk. eg. 100,000 files of 1 byte each taking 1 block of size 4KB would occupy ~390 MB on disk (instead of 100KB as one would assume).