Not a big deal, but the symbol for kilo is 'k', not 'K'.
$bytes returns a cap K when used with .suf. I havent checked dccs but they probably use K as well.

No. K is the correct symbol, since kilo here isn't 1000, it's 1024 (we're talking about bytes, and 1 KB = 2^10 = 1024 bytes). Technically, k is used for 10^3 and K for 2^10. Read this. Windows seems to agree with this too, since it uses KB everywhere.

The way I've generally seen it is KB = kiloBYTE kb = kileBIT.

thats right, i did not know.
thank you qwerty for the explanations+link.

you should use Kb for kiloBIT, not kb, technically