Convert from Megabyte (MB) to Kilobyte (KB) 

Unit Definition (Megabyte (MB))
The Megabyte is a unit of information. It is very common in the computer world, but it is poorly defined. Often it means 1 000 000 bytes, but sometimes it means 2²⁰ = 1 048 576 bytes. As if that weren't confusing enough, the 1.44 megabytes stored on "high density" floppy disks are actually megabytes of 1 024 000 bytes each. This uncertainty is a major reason for the recent decision of the International Electrotechnical Commission to establish new binary prefixes for computer science.

Unit Definition (Kilobyte (KB) )
The Kilobyte is a unit of information equal to 1000 bytes. As a unit of computer storage, however, the kilobyte is usually equal to 1024 bytes, although this should now be called a kibibyte.