Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!src.honeywell.com!skyler.mavd.honeywell.com!rlb From: rlb@skyler.mavd.honeywell.com (Randal L. Barnes) Newsgroups: comp.os.cpm Subject: Re: 8 meg limit Message-ID: <1991Jan23.223619.49@skyler.mavd.honeywell.com> Date: 24 Jan 91 04:36:18 GMT References: Lines: 29 In article , pevans@cynic.wimsey.bc.ca (Phillip Evans) writes: > Where did/does the 8 meg limit on logical disk size in CP/M come from? It has to do with the fact that CP/M uses a 16 bit logical block pointer, Since CP/M also uses 128 byte logical sectors (sector blocking/deblocking routines change the physical sector size on the disk but the logical sector size remains at 128), the maximum logical disk size is: 65536 * 128 = 8192K My Molecular Series 9 system has drive B set up as an 8 meg drive. Doing a STAT B:DSK: yields the following: B: Drive Characteristics 65536: 128 Byte Record Capacity 8192: Kilobyte Drive Capacity 1024: 32 Byte Directory Entries 0: Checked Directory Entries 256: Records/ Extent 32: Records/ Block 256: Sectors/ Track 0: Reserved Tracks -- Randal L. Barnes rlb@skyler.mavd.honeywell.com Tea, Earl Grey, HOT! Honeywell Military Avionics Division 612/542-5021