File Breaker is a freeware application used to divide files (any size) in smaller parts and can keep them in limited capacitance devices, for then obvious, it returns the to unite.
It can divide the file by specifying the size of the parts or, the number of parts in those who wants to divide it, File Breaker do the remainder in a very effective way, by avoiding any error type.
Then rots, with the same application and the same facility, return to unite the parts to form your file.
The interface is very intuitive and easy to use, not requires great explanation, but is of great utility and fulfills effectively your function.
Moreover, it integrates, optional, to the Windows explorer's contextual menu in order that divides the single file is about a few cliks.