Date: Sat, 22 Sep 2001 21:42:13 -0400 From: "Brandon S. Allbery KF8NH" <allbery@ece.cmu.edu> To: "Chad R. Larson" <chad@DCFinc.com> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: hw.ata.wc && hw.ata.tags && softupdates short question Message-ID: <168920000.1001209332@vpn45.ece.cmu.edu> In-Reply-To: <20010922182052.B16388@freeway.dcfinc.com> References: <20010921035414.B75668@dogma.freebsd-uk.eu.org> <XFMail.20010921122607.doconnor@gsoft.com.au> <20010922182052.B16388@freeway.dcfinc.com>
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On Saturday, September 22, 2001 18:20:52 -0700, "Chad R. Larson" <chad@DCFinc.com> wrote: +----- | Years ago, there was a main-frame drive manufacturer who used the | spindle motor as a generator in the case of a power failure. The | kinetic energy in the spinning disk pack was converted to electricity, | so there would be enough energy to flush the cache to disk and then park | the heads. I think it was Century. You know, those drives that looked | like small washing machines and had removable disk packs? | | I wonder if any of the current PC drive manufacturers do (or have | considered doing) the same thing? +--->8 I'm thinking that that's dubious because of entropy. It might have been possible to pull it off with older drives if the flush could use a low-power mode, but modern disks are likely to be a lost cause. -- brandon s. allbery [os/2][linux][solaris][freebsd] allbery@kf8nh.apk.net system administrator [JAPH][WAY too many hats] allbery@ece.cmu.edu electrical and computer engineering KF8NH carnegie mellon university [linux: proof of the million monkeys theory] To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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