Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!lll-lcc!ames!ucbcad!ucbvax!CORY.BERKELEY.EDU!dillon
From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga
Subject: : Re: Great big huge floppy disk?
Message-ID: <8612270158.AA04712@cory.Berkeley.EDU>
Date: Fri, 26-Dec-86 20:58:48 EST
Article-I.D.: cory.8612270158.AA04712
Posted: Fri Dec 26 20:58:48 1986
Date-Received: Sat, 27-Dec-86 00:45:11 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: University of California at Berkeley
Lines: 15

>>
>>...  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?)
>

	Well... actually that's not the reason.  The reason is that
when you are writing to disk, the data on the track must first be READ,
then re-written (since you are not modifying the ENTIRE track, only
several sectors on that track).

			-Matt