From owner-freebsd-current@FreeBSD.ORG  Wed Feb  2 22:34:12 2011
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Date: Wed, 2 Feb 2011 22:34:12 +0000
From: Alexander Best <arundel@freebsd.org>
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	<20110202210211.GM65811@acme.spoerlein.net>
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Cc: Alexey Shuvaev <shuvaev@physik.uni-wuerzburg.de>,
	Xin LI <delphij@delphij.net>,
	"Julian H. Stacey" <jhs@berklix.com>, Kurt Jaeger <pi@opsec.eu>
Subject: Re: looking for a fast way to dump a dvd to a file on my hdd
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On Wed Feb  2 11, Ulrich Spörlein wrote:
> On Wed, 02.02.2011 at 12:04:58 -0800, Xin LI wrote:
> > On 02/02/11 11:54, Alexander Best wrote:
> > > so far dd(1) with a bs=2048 finished after:
> > > 
> > > 4676648960 bytes transferred in 1639.108763 secs (2853166 bytes/sec)
> > 
> > Just curious - how will recoverdisk(1) perform?  I haven't tried it
> > myself but it uses much larger window which could be faster.
> 
> +1 for recoverdisk. I hacked it so that it will also cope with media
> that has weird sectorsizes like 2352 bytes. It is awesome for reading
> optical media now, thanks to retries, large read requests and the
> ability to save progress (so you can try the failing sectors in another
> drive).

thanks a lot for all your replies. :)

here are some statistics i gathered:

LINUX:
-----
6,8 MB/s @ bs=2048
6,7 MB/s @ ibs=1M
	   obs=64M
6,6 MB/s @ bs=32K

FreeBSD:
-------
2,8 MB/s @ bs=2048
9,5 MB/s with recoverdisk /wo failures
9,5 MB/s @ ibs=1m
	   obs=64m
9,5 MB/s @ ibs=32k
	   obs=64m

indeed recoverdisk seems to be ideal for my case. i'll try to use it more
often. ;)

thanks again.

cheers.
alex

ps: seems linux is completely ignoring blocksizes, but that's their problem. ;)

> 
> Regards,
> Uli



-- 
a13x