Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utcs!wagner From: wagner@utcs.UUCP Newsgroups: comp.sys.amiga Subject: Re: Re: Great big huge floppy disk? Message-ID: <1986Dec26.102304.12222@utcs.uucp> Date: Fri, 26-Dec-86 10:23:04 EST Article-I.D.: utcs.1986Dec26.102304.12222 Posted: Fri Dec 26 10:23:04 1986 Date-Received: Fri, 26-Dec-86 18:40:03 EST References: <736@vaxb.calgary.UUCP> <1164@cbmvax.cbmvax.cbm.UUCP> <1768@sunybcs.UUCP> Reply-To: wagner@utcs.UUCP (Michael Wagner) Organization: University of Toronto Computing Services, general purpose UNIX Lines: 17 Keywords: cause of them diskcopy blues Checksum: 19567 In article <1768@sunybcs.UUCP> jmpiazza@gort.UUCP (Joseph M. Piazza) writes: >In article <1164@cbmvax.cbmvax.cbm.UUCP> daveh@cbmvax.cbm.UUCP (Dave Haynie) writes: >> >>... The blitter is used to decode [data from the read track], >>usually a sector at a time, and it achieves this decoding in one >>blitter pass (though as I recall, it takes three passes to encode the data). > > Which explains why copying disk to RAM: is so much faster than RAM: >to disk. (I have a single drive system -- could you tell?) I don't think so. Those blitter passes should be fast. But the fact remains that writing with AmigaDOS is about half the speed of reading (according to the benchmark program posted recently). Adequate caching of the disk does not improve this significantly. Nor does large blocksize. Still remains a mystery. Michael