Date: Mon, 10 Dec 2001 01:49:23 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: "David W. Chapman Jr." <dwcjr@inethouston.net> Cc: Julian Elischer <julian@elischer.org>, Matthew Dillon <dillon@apollo.backplane.com>, Greg Lehey <grog@FreeBSD.ORG>, Daniel O'Connor <doconnor@gsoft.com.au>, sthaug@nethelp.no, freebsd-current@FreeBSD.ORG, j@uriah.heep.sax.de, joerg_wunsch@uriah.heep.sax.de Subject: Re: "Dangerously dedicated" yet again (was: cvs commit: src/sys/kern subr_diskmbr.c) Message-ID: <3C148523.9A0E1463@mindspring.com> References: <200112100559.fBA5x2x43757@apollo.backplane.com> <Pine.BSF.4.21.0112092202050.27605-100000@InterJet.elischer.org> <20011210062338.GA51934@leviathan.inethouston.net>
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"David W. Chapman Jr." wrote: > > > :> > IBM DTLA drives are known to rotate fast enough near the spindle > > > :> > that the sustained write speed exceeds the ability of the controller > > > :> > electronics to keep up, and results in crap being written to disk. > > > > > > I would adssume it actually the tracks FURTHEREST from the spindle.. > > Wouldn't the linear speed be faster closer to the spindle at 7200 RPM > than at the edge? Linear speed is closes at the edge, but magnetic domain density is higher at the spindle, for a uniform rotation rate. I think that the electronics ended up being designed for the average rate. PS: The encoding frequency is higher at the spindle, as well. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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