Date: Thu, 24 Sep 1998 10:28:24 +0930 (CST) From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: hackers@FreeBSD.ORG, abial@nask.pl, oppermann@pipeline.ch, netmonger@genesis.ispace.com, (Mike Smith) <mike@smith.net.au> Subject: Re: backport of atapi-cd to -STABLE Message-ID: <XFMail.980924102824.doconnor@gsoft.com.au> In-Reply-To: <199809231833.UAA07940@labinfo.iet.unipi.it>
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> to clarify, the so-called jitter correction in "cdd" serves for those > drives whose firmware does not guarantee that the data you get from the > disk are for the block you requests and instead could give you data for > a nearby block (presumably, but this is just an assumption, from time > to time the firmware misses a block and passes you the next one). It happens because CDDA doesn't have block markers, so the firmware can't actually tell if it got the right block when it reads it.. It is essentially working on 'dead reckoning' to get the right block. Jitter correction checks the blocks to see if they 'line up' or not.. --------------------------------------------------------------------- |Daniel O'Connor software and network engineer for Genesis Software | |http://www.gsoft.com.au | |The nice thing about standards is that there are so many of them to| |choose from. -- Andrew Tanenbaum | --------------------------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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