I just saw that this is a way you can easily determine the blocksize of a filesystem, at least a Mac/Unix/Linux filesystem:
$ echo foo > foo $ du -h foo 4.0K foo
I tried to do the same thing with
touch foo, but that didn’t work. Without digging into it more, the key seems to be in having very little text in the file, at which point the
du command shows the minimum block size for the file.