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