Date: Sun, 17 Apr 2016 10:49:13 -0700 (PDT) From: "IMGuru" <jpmamu@gmail.com> To: questions@freebsd.org Subject: AprilDhamalFataafat4U Message-ID: <5713cc99.4b43620a.330c2.50c5@mx.google.com>
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PGh0bWw+PGJvZHk+PFA+VGhpcyBpcyB0ZXN0IG1haWwgdG8gdmFyaWZ5IHlvdXIgYmxv ZzwvUD4NCjxQPldQRGVhbHM8L1A+DQo8UD4jMjM1ZmF0YWZhdGEkMTAxIzIwMTYqJDEw NTcyPC9QPjwvYm9keT48L2h0bWw+ From owner-freebsd-questions@freebsd.org Sun Apr 17 17:55:14 2016 Return-Path: <owner-freebsd-questions@freebsd.org> Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 46F12B11068 for <freebsd-questions@mailman.ysv.freebsd.org>; Sun, 17 Apr 2016 17:55:14 +0000 (UTC) (envelope-from wblock@wonkity.com) Received: from wonkity.com (wonkity.com [67.158.26.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "wonkity.com", Issuer "wonkity.com" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 18E251132 for <freebsd-questions@freebsd.org>; Sun, 17 Apr 2016 17:55:13 +0000 (UTC) (envelope-from wblock@wonkity.com) Received: from wonkity.com (localhost [127.0.0.1]) by wonkity.com (8.15.2/8.15.2) with ESMTPS id u3HHtCOA065635 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sun, 17 Apr 2016 11:55:12 -0600 (MDT) (envelope-from wblock@wonkity.com) Received: from localhost (wblock@localhost) by wonkity.com (8.15.2/8.15.2/Submit) with ESMTP id u3HHtCWD065632; Sun, 17 Apr 2016 11:55:12 -0600 (MDT) (envelope-from wblock@wonkity.com) Date: Sun, 17 Apr 2016 11:55:12 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: Michael Powell <nightrecon@hotmail.com> cc: freebsd-questions@freebsd.org Subject: Re: tool for mapping away bad blocks on an external disk In-Reply-To: <nf0h0u$5ij$1@ger.gmane.org> Message-ID: <alpine.BSF.2.20.1604171136320.30232@wonkity.com> References: <20160417072641.GA2358@c720-r292778-amd64> <20160417093957.0b1acb4c37d7c15a4b06af88@sohara.org> <alpine.BSF.2.20.1604171023510.30232@wonkity.com> <nf0h0u$5ij$1@ger.gmane.org> User-Agent: Alpine 2.20 (BSF 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset=US-ASCII X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.4.3 (wonkity.com [127.0.0.1]); Sun, 17 Apr 2016 11:55:12 -0600 (MDT) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: User questions <freebsd-questions.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>; List-Post: <mailto:freebsd-questions@freebsd.org> List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=subscribe> X-List-Received-Date: Sun, 17 Apr 2016 17:55:14 -0000 On Sun, 17 Apr 2016, Michael Powell wrote: > Back in the day (Fixed Direct Access SCSI-2 device) you could use the > controller BIOS to do what used to be known as a "low level format" of SCSI > drives in order to attempt to squeak a little more life from them. And if > new bad spots did not begin to pop again right away you might be good to go > for a while. If they did it indicated mass media failure that would just > avalanche. The old Adaptec 1540 and 2940 controllers come to mind (Ctrl-A to > enter the controller BIOS during POST). > > Can't do this through a USB subsystem. Or to pretty much any drive any more. They will accept the low-level format command, but return immediately. Or that's what happened the last time I tried it, years ago. It's been a long time since hard drives gave any direct access to the media. Everything goes through the controller on the drive now, which handles all that transparently. So blocks that appeared bad might be already mapped out by the drive.
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