From owner-freebsd-scsi Fri Jul 30 19: 9:59 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from mail.HiWAAY.net (fly.HiWAAY.net [208.147.154.56]) by hub.freebsd.org (Postfix) with ESMTP id 6F7C315252 for ; Fri, 30 Jul 1999 19:09:55 -0700 (PDT) (envelope-from dkelly@nospam.hiwaay.net) Received: from nospam.hiwaay.net (tnt8-216-180-15-82.dialup.HiWAAY.net [216.180.15.82]) by mail.HiWAAY.net (8.9.1a/8.9.0) with ESMTP id VAA27680; Fri, 30 Jul 1999 21:08:30 -0500 (CDT) Received: from localhost (localhost [127.0.0.1]) by nospam.hiwaay.net (8.9.3/8.9.3) with ESMTP id UAA77182; Fri, 30 Jul 1999 20:30:41 -0500 (CDT) (envelope-from dkelly@nospam.hiwaay.net) Message-Id: <199907310130.UAA77182@nospam.hiwaay.net> X-Mailer: exmh version 2.0.2 2/24/98 To: "Francisco Reyes" Cc: "freebsd-scsi@FreeBSD.ORG" From: David Kelly Subject: Re: Which SCSI controller with non destructive verify? In-reply-to: Message from "Francisco Reyes" of "Fri, 30 Jul 1999 00:18:38 EDT." <199907300417.AAA20863@vulcan.addy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 30 Jul 1999 20:30:41 -0500 Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org "Francisco Reyes" writes: > On Thu, 29 Jul 1999 21:31:07 -0500, David Kelly wrote: > > >> Bus Logic SCSI controller ... verify ... > >> a warning that this would erase my data. > > > >What about: > ># dd if=/dev/sd0 bs=64k of=/dev/null > > Would this be equivalent to what a "verify" from a controller > does? > Doesn't the verify function in a controller tries to write? If the nondestructive verify function writes then it would scare me. I have seen 3rd party Macintosh utilities that were able to read-write-read verify, or a modified version that wrote something else in the middle, then wrote the original data, and read it again just to be sure. Think FWB's Hard Drive Toolkit does this. -- David Kelly N4HHE, dkelly@nospam.hiwaay.net ===================================================================== The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message