Date: Sun, 17 Apr 2016 09:39:57 +0100 From: Steve O'Hara-Smith <steve@sohara.org> To: Matthias Apitz <guru@unixarea.de> Cc: freebsd-questions@freebsd.org Subject: Re: tool for mapping away bad blocks on an external disk Message-ID: <20160417093957.0b1acb4c37d7c15a4b06af88@sohara.org> In-Reply-To: <20160417072641.GA2358@c720-r292778-amd64> References: <20160417072641.GA2358@c720-r292778-amd64>
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On Sun, 17 Apr 2016 09:26:41 +0200 Matthias Apitz <guru@unixarea.de> wrote: > > Hello, > > I have an older external disk, connected through USB, which has bad > blocks: The tool you're looking for is badsect - I'm moderately surprised it's still around, the last time I used it was on FreeBSD 1.1.5.1 but it is still in FreeBSD 10.3. It doesn't do the analysis though - you'll have to do that with the filesystem unmounted and just used dd conv=noerror if=<device> of=/dev/null to read the whole device and pull the duff sectors out of the error messages. However it's been a *long* time since this was worth doing except perhaps as a last ditch data recovery exercise, drives have had internal sector remapping for a long time now and when that stops working they are well and truly banjaxed. -- Steve O'Hara-Smith <steve@sohara.org>
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