Date: Thu, 27 Sep 2007 12:22:30 -0700 From: Chuck Swiger <cswiger@mac.com> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: Don O'Neil <lists@lizardhill.com>, freebsd-questions@freebsd.org Subject: Re: Stress testing/burning in HDDs Message-ID: <D58531E3-F963-4B8F-9CB8-02D37BC53502@mac.com> In-Reply-To: <20070927210423.K20243@wojtek.tensor.gdynia.pl> References: <001201c8012d$e747d620$0a00020a@mickey> <0079D5BC-57FB-4013-B772-545D7D83203B@mac.com> <20070927210423.K20243@wojtek.tensor.gdynia.pl>
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On Sep 27, 2007, at 12:04 PM, Wojciech Puchar wrote: >> It's reasonable to start with something like a: >> >> dd if=/dev/your_disk of=/dev/null bs=5120 >> >> ...to at least try reading every sector on the drive as a basic >> sanity check. > > why so small blocks of 10 sectors? > > i use bs=64k at least goes faster. Agreed, but he asked for a stress-test-- arguably, hitting with a size of 512 might be better for that purpose than anything faster. I chose 5120 because many ATA devices seem to have a maximum request/ DMA-transfer size of 16 sectors, and 512 * 10 is convenient and fits under that. -- -Chuck
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