Date: Fri, 13 Jan 2006 15:26:22 +0100 From: Stefan Bethke <stb@lassitu.de> To: "Christoph P. Kukulies" <kuku@kukulies.org> Cc: freebsd-hackers@freebsd.org Subject: Re: increasing dd disk to disk transfer rate Message-ID: <AFCC1517-AEFE-4263-9FA5-251EF6108845@lassitu.de> In-Reply-To: <20060113132915.GA6848@kukulies.org> References: <200601120948.k0C9mcqR092895@www.kukulies.org> <20060112211300.GB13244@cirb503493.alcatel.com.au> <20060112212337.GA80216@nargothrond.kdm.org> <20060113132915.GA6848@kukulies.org>
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Am 13.01.2006 um 14:29 schrieb Christoph P. Kukulies: > Just for the record: Before I wanted to give back in my faulty disk > to my computer supplier as a case for warranty, I zeroed out the > faulty > disk. > > dd if=/dev/zero of=/dev/ad2 bs=1m > > It took half an hour to zero out the 80GB. Transferrate 44 MB/s? > And not a single error ? Or is this normal? Depending on the model, 44 MB/s seems quite OK. Certainly on the fast side for a 2.5" laptop drive, but not unheard of these days. It is quite possible that the disk controller had a couple of sectors it could not read anymore (and giving I/O errors for them), but was able to reallocate once you wrote to them. I would still ditch the disk, though. Would be interesting to see what the smart reallocated sector count says. Stefan -- Stefan Bethke <stb@lassitu.de> Fon +49 170 346 0140
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