1. Right click the file to be compressed and select Add to Compressed File 2. In the dialog box that appears again, there will be "compressed volume size, bytes" in the lower left corner. Enter the size of the small file you want to divide the file into in the selection box below, for example, if you want to divide the file into 50M, enter 50M 3. Compress, To compress the volume size, 1457664 - 3.5 "98078k - zip - 100 650m - CD-650m 700m - CD-700m in the byte drop-down menu represent the preset volume size in the program. For example, the first 1457664 - 3.5" means that the file to be compressed by volume is divided into 1457664 B (that is, 1.4M), which is just the capacity of a 3.5-inch floppy disk.