um...256 KB * 4 = 1024 KB -> 1 MB
Well, actually, there's a problem :
some ppl claim that 1MB = 2^20 (in power of 20) = 1 048 576
and others say 1MB = 10^6 = 1 000 000
i like the fisrt one more
though many hardware companies use the latter
when you buy a HDD its space is given in the latter way