Date: Mon, 25 Nov 1996 23:03:52 -0500 From: Joel Ray Holveck <joelh@gnu.ai.mit.edu> To: msmith@atrad.adelaide.edu.au Cc: msmith@atrad.adelaide.edu.au, terry@lambert.org, grog@lemis.de, chat@FreeBSD.org, smut@clem-162.dorms.tamu.edu Subject: Re: SCSI A/V drives Message-ID: <199611260403.XAA10823@hill.gnu.ai.mit.edu> In-Reply-To: <199611260210.MAA00537@genesis.atrad.adelaide.edu.au> (message from Michael Smith on Tue, 26 Nov 1996 12:40:17 %2B1030 (CST))
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> Okay, understood... I hadn't realized that the recal was a > time-consuming process. Why does the drive logic not continuously > update the thermal expansion factor it uses, each time it seeks? Some do; it's an expensive process though, and often servo logic doesn't have the grunt for it (think 'low cost'). Expensive in terms of time (and where is it spent? Calculations or head seeks?) or in terms of circuitry or what? Is this type of logic usually handled by a controller with a PROM or by custom circuitry? Thanks, Joel
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