This is the file compression factor, from "0" (no compression) to "100" (maximum compression). Values 2-100 are treated as percentages. They specify how much of the space saved by file compression is to be deleted from the compressed records. A factor of "1" is a special case - it gives the default, which causes 70% of the space saved by compression to be deleted from each record. Compression is established only at the time the file is created.