Hello Wojciech,

   WP> you mean 100MB or 100Mb?

Assume the following definitions for anything I write where
I don't explicitly define otherwise...

   MB = Megabit   = 1,000,000 bits.
   Mb = Megabyte  = 1,000,000 bytes.
        (unless I'm talking about memory, where "16Mb"
         probably implies 2^24 bytes.  ;-)
   Kb = Kilobyte  = 1,024 bytes (note the upper-case K).
   kB = kilobit   = 1,000 bits.
   km = kilometre = 1,000 metres.
   GB/S = wishful thinking.

Where practical I try to stick to the SI intepretation of
prefixes like this.
                                          ...hope this helps.
Regards,
   - Andy Ball