1. A method of transferring disk images from one computer to a plurality of computers, comprising the steps of: transmitting repetitions of a data stream containing a disk image over at least one network connection, the data stream having a beginning, an end, and at least one join point between the beginning and the end; and downloading the disk image to at least two computers, wherein the downloading to at least one computer begins at a join point within a repetition of the data stream and ends in a subsequent repetition of the data stream.