Date: Wed, 5 Jan 2011 13:26:02 -0500 From: Chris Brennan <xaero@xaerolimit.net> To: Ian Smith <smithi@nimnet.asn.au> Cc: Bruce Cran <bruce@cran.org.uk>, FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: a new hard-drive in a 2y/o laptop Message-ID: <AANLkTinfVLGomOj-Nanvr4sgei-p=HQ9-Mh0rXQQ7E%2Bw@mail.gmail.com> In-Reply-To: <20110105152725.U49334@sola.nimnet.asn.au> References: <20101229120038.3DFB0106591A@hub.freebsd.org> <20101230133126.O36121@sola.nimnet.asn.au> <AANLkTinCZuupW%2BGFMeL70nPO90tZAAJNj8g0SaOztsR3@mail.gmail.com> <20101231105353.S36121@sola.nimnet.asn.au> <AANLkTinSbE8d=iYES78GJmYO2PyOAGHMjwQ%2B2HT45yxc@mail.gmail.com> <20110102102255.00004f57@unknown> <20110102230702.N49334@sola.nimnet.asn.au> <20110103022619.O49334@sola.nimnet.asn.au> <AANLkTimkCdtULT9jfNtwKcfxF8R-TQ_j=qZgS-Y-YGfu@mail.gmail.com> <20110104143245.P49334@sola.nimnet.asn.au> <AANLkTi=Aqh4cpmdkHx1QsTyoYh7nhinEfDUuPO3fUAh5@mail.gmail.com> <alpine.BSF.2.00.1101041840310.14633@wonkity.com> <20110105152725.U49334@sola.nimnet.asn.au>
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On Wed, Jan 5, 2011 at 12:44 AM, Ian Smith <smithi@nimnet.asn.au> wrote: > > Saw Chris' later message that -F isn't there for him, but here's what > should be, on the data, the sure-fire way to clobber that last sector: > > dd if=/dev/zero of=/dev/ad4 oseek=1465149167 > > which command SHOULD report just 512 bytes written (we're sure it can't > write past the end of the disk with no count specified), after which: > > dd if=/dev/ad4 iseek=1465149167 | hd > > SHOULD show zeroes from 00000000 to 000001ff (ie next block 00000200) > If not, there really must be some hardware issue with writing? > > Hopefully getting there! > > cheers, Ian > [..] Fixit# sysctrl kern.geom.debugflags=16 kern.geom.debugflags: 0 -> 16 Fixit# dd if=/dev/zero of=/dev/ad4 oseek=1465149167 dd: /dev/ad4: end of device 2+0 records in 1+0 records out 512 bytes transferred in 0.0100001 secs (51195 bytes/sec) Fixit# dd if=/dev/ad4 iseek=1465149167 | hd 1+0 records in 1+0 records out 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 512 bytes transferred om 0.009863 secs (51912 bytes/sec) * 00000200 Fixit# [..] restarting and back to sysinstall from BETA1 is nice dice ... same original error ... can I just zero the whole drive?
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