Date: Tue, 29 Oct 2002 02:31:33 -0800 From: David Schultz <dschultz@uclink.Berkeley.EDU> To: Peter Wemm <peter@wemm.org> Cc: "Daniel O'Connor" <doconnor@gsoft.com.au>, Chuck Robey <chuckr@chuckr.org>, Kenneth Culver <culverk@yumyumyum.org>, "Wilkinson, Alex" <Alex.Wilkinson@dsto.defence.gov.au>, hackers@FreeBSD.ORG Subject: Re: [hardware] Tagged Command Queuing or Larger Cache ? Message-ID: <20021029103133.GA18812@HAL9000.homeunix.com> In-Reply-To: <20021029042415.967662A88D@canning.wemm.org> References: <1035861964.77698.83.camel@chowder.localdomain> <20021029042415.967662A88D@canning.wemm.org>
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Thus spake Peter Wemm <peter@wemm.org>: > Actually, not even then. Modern IDE drives only write entire tracks at a > time. If you modify a single sector, then the drive has to read the entire > track into the buffer, in-place edit the sector, and then rewrite the entire > track. [...] > And that completely blows FFS's assumptions out of the water. And what > is sad is that many SCSI disks are similar these days. But not all of > them (I'm told). I've heard this before. It would be very useful to have information about which drives have this misfeature, but I guess it isn't the sort of thing that hard drive manufacturers like to advertise. Does anyone have any data on track-writing drives? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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