Multi Threaded File Copy with Progress

Hai, My Requirement Need to copy a big files to another disk using java Multi Threads. Need to implement Thread pooling (Thread Q ). need to create 4 or 5 threads and if my file size is 500 MB. need to give 50MB for each thread . Once the thread job is done then need to assign the remaining jobs. If any doubts pls let me know. Regards Viswa