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Date:      Fri, 02 Aug 1996 19:12:17 -0700
From:      Darryl Okahata <darrylo@hpnmhjw.sr.hp.com>
To:        Jim Shankland <jas@flyingfox.COM>
Cc:        freebsd-hardware@freebsd.org
Subject:   Re: h/w requirements for CD-R writing? 
Message-ID:  <199608030212.AA085678338@hpnmhjw.sr.hp.com>
In-Reply-To: Your message of "Fri, 02 Aug 1996 13:09:41 PDT." <199608022009.NAA14408@saguaro.flyingfox.com> 

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> The tentative plan is to dedicate an old 66 MHz Pentium box with
> an NCR53C810 on the motherboard, with a 1.3 GB SCSI-2 HP disk
> (4KRPM, 13.5 ms average access, ca. 2 MB/s sustained transfer rate),
> plus a CD-writer to be determined, to this task.  Is this
> likely to work?

     Probably -- but you haven't said how much RAM you have.  I've
burned CDs using a 25MHz 386 and a 1542B (both HD & burner are connected
to the 1542).  However, an important criteria is RAM; this lowly 386 has
16MB.  You've got to have enough free RAM to allow the team(1) processes
to act as a user-land cache, which probably means that you should have
at least 12-16MB of RAM (assuming that you do NOT have any memory-hungry
programs like X11 ones running).  You can probably get by with 8MB RAM,
but I'm not sure.  I wouldn't even think about it with only 4MB.

     Note that burning a CD is a disk-space-intensive, two-step process:
(1) you create an CDROM image file from the files that you want to go
onto the CD, and (2) you burn the CD using the image file (and NOT the
original directory tree).  The bottom line is that you'll need again as
much disk space as that used to hold the files that you want to place
onto the CD.  In a worst-case scenario (a completely full CDROM), you'll
need 650MB+650MB==> ~1.3GB of disk space.  However, if you're only
placing ~400MB of files onto the CDROM, you'll only need around ~800MB
of space.

     Also note that you cannot always use symlinks in the original
directory tree.  In the case of symlinks pointing to files, the symlinks
are either placed onto the CD, or they're ignored (there's no way to
follow them).  In the case of symlinks pointing to directories, I think
they can be placed onto the CD, followed or ignored (I haven't tried
this).

     -- Darryl Okahata
	Internet: darrylo@sr.hp.com

DISCLAIMER: this message is the author's personal opinion and does not
constitute the support, opinion, or policy of Hewlett-Packard, or of the
little green men that have been following him all day.



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