From owner-freebsd-questions@FreeBSD.ORG Sat Dec 12 16:54:38 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 22BE31065694 for ; Sat, 12 Dec 2009 16:54:38 +0000 (UTC) (envelope-from anti_spam256@yahoo.ca) Received: from web65506.mail.ac4.yahoo.com (web65506.mail.ac4.yahoo.com [76.13.9.50]) by mx1.freebsd.org (Postfix) with SMTP id BB7E48FC29 for ; Sat, 12 Dec 2009 16:54:37 +0000 (UTC) Received: (qmail 55953 invoked by uid 60001); 12 Dec 2009 16:54:36 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.ca; s=s1024; t=1260636876; bh=dUr038qH3JiVYK0jjE5fd4MbKGm3f9M/TXBCmCH4zLo=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type; b=3PlkEgJYFi/omRRaHErHdVxBlhUFeQUPPRFjH+umkXrvFdEX9sHuOLlNVduui1Qj4qZabrg5LCXCzij1F+0jBH5oyiCCWLWEoZeeDK1s4CooVCIAEWJ5CEwp1OqXkaR9OZytqzjCThMnO5KTdWL1zZIw5ZKCobvA3Esk15cV4fQ= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.ca; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type; b=joNAFxE+sX1M6rFatEsPLC61S7T8oBPNFs1Jhe9EBhTaqfGDxnCMKLTG1aG9pUjyJHuIpjFQ6g2rieSGuXOIvzBQEiM7CRnjRGNg9NqgK62K8NnV1Yew6a3b6R2VR//G3qEWQVeT4y/X86YCTWkLQcsIsCULrDdduvcRgM0daMQ=; Message-ID: <503306.54962.qm@web65506.mail.ac4.yahoo.com> X-YMail-OSG: UmoIB9EVM1mFKSc5yCNgODto8yylHetBgCY9rPTIpzuEhuHR4C4o5Kz4l8BsQGqX2bvxJRDyBu6tG79oXXJhh.AMEWS5A3C9ccNda4mdqjy6E0IdCpFWqSPnbgqI.pPKwBp47umxTE1ZgKlv03XQ5dSfC1Go9MtEf_reQX9jLl3wHqObDdW4io2ZwijoXDrVzZiHhbjAhgHW5OjvUN4rF3ddAuZusX1I_sBRkWd1LDfxFqQh67enLnuKTdFmBIrmn_IDI4cjqN3P5gE9sm5krjI_KZUzgbkiPY00JanQ21nzHTHVrtvluKFxpB02pbhwOWE.k.H3dJiokE2trtRjCLDoQ7vFgY0Yu8Zq245UNFWqRya8QIzFJM.kvX.wVbGGlEJ93g2tZsA7dKnW3E4Ces7wGNfAme0N3DDS1h.fUAhpJgklQsAbM4mduY4e_Hbfuo_4Sg-- Received: from [208.99.137.71] by web65506.mail.ac4.yahoo.com via HTTP; Sat, 12 Dec 2009 08:54:36 PST X-Mailer: YahooMailClassic/9.0.19 YahooMailWebService/0.8.100.260964 Date: Sat, 12 Dec 2009 08:54:36 -0800 (PST) From: James Phillips To: freebsd-questions@freebsd.org In-Reply-To: <20091212104900.4587010656B6@hub.freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: ly4uk Root Subject: Re: disk with high frequency noise only on FreeBSD X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 12 Dec 2009 16:54:38 -0000 > Date: Fri, 11 Dec 2009 23:52:50 +0200 > From: ly4uk Root > Subject: disk with high frequency noise only on FreeBSD > To: freebsd-questions@freebsd.org > Message-ID: <1260568370.99298.49.camel@localhost> > Content-Type: text/plain > cleaning), but drive is still squeaking. Now I'm using > freebsd 8.0, not > fresh install, got it from seven release (at almost year > ago) by > tracking stable branch. All noise came exactly in one > reboot while > upgrading to 8.0-RC2. > So, it would be interesting to get Your answer about > possible > solutions(if You know such) or maybe some comments(if > don't). I will be > very happy for that, many excuse for disturbance. > Now, this post is interesting. I'm sure many people with a software background may be tempted to write this report off as completely implausible. The truth is even "non-moving" parts such as inductors and possibly capacitors can move in response to an applied signal. For example, my ADSL modem with no moving parts makes an audible hissing noise louder than the (80mm) fan noise of my BSD server. I have no idea what would be causing this in 8.0-RC2, but I can suggest what to look for: anything polling the drive in the audible frequency range (20 to 20 thousand times per second). Another possiblity is any action the repeats at that rate, but was not present in ealier versions. The timer interrupt is in that range, but other systems like GNU/Linux (before the tickless kernel) and Windows use a similar timer. To the original poster: you say this is a laptop. How do you know the noise is coming from the hard drive and not some other component like the speakers/Network card/fan? Regards, James Phillips __________________________________________________________________ Looking for the perfect gift? Give the gift of Flickr! http://www.flickr.com/gift/