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From: farren@well.UUCP (Mike Farren)
Newsgroups: net.micro.amiga
Subject: Re: date command and second drive
Message-ID: <854@well.UUCP>
Date: Sat, 29-Mar-86 06:28:15 EST
Article-I.D.: well.854
Posted: Sat Mar 29 06:28:15 1986
Date-Received: Wed, 2-Apr-86 01:24:57 EST
References: <462@Navajo.ARPA>
Reply-To: farren@well.UUCP (Mike Farren)
Distribution: net
Organization: Whole Earth Lectronic Link, Sausalito CA
Lines: 18

In article <462@Navajo.ARPA> rokicki@Navajo.ARPA (Tomas Rokicki) writes:
>
>Also, does anyone have any idea why a second drive requires about 30K?  Do
>they load another driver, or what?  Thanks!

    Each drive requires a buffer which is as long as an entire track's worth
of bits in their encoded form, with one clock bit and one data bit for each
"actual" bit of data.  With 11 sectors per track, two heads, and 528 bytes 
per sector, that adds up to about 24K.  Add a little more to allow for slop,
and you get to 30K pretty quickly.  This isn't exactly the most ELEGANT way
of doing a disk driver, but it does allow such goodies as reading most of
the different 3-1/2" disk formats out there...


-- 
           Mike Farren
           uucp: {your favorite backbone site}!hplabs!well!farren
           Fido: Sci-Fido, Fidonode 125/84, (415)655-0667