ocr: Slacks Space Predictor Settings To predict how much space a group offiles would occupy on a volume ofa particular size, Macslack needs to know the cluster size on the volume. If you know the cluster size you want to use, enter it in the "Cluster size"box. Otherwise,use the Calculator. (Macsiack uses Apple's defaults for calculating HFS+ cluster sizes;see the manual for details.) Calculator DirectEntry Choose a volume type and size. HFS Volume size in megabytes: Cluster size in Kilobytes: HFS+ 255 Calculate Cluster Size Accept Current Cluster Size Cancel