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Date:      Thu, 3 Feb 2011 03:19:44 -0800
From:      Xin LI <delphij@gmail.com>
To:        gljennjohn@googlemail.com
Cc:        freebsd-current@freebsd.org
Subject:   Re: looking for a fast way to dump a dvd to a file on my hdd
Message-ID:  <AANLkTimdexcwAcTJ0-PRUkiyBqffH_bv%2BCiSEOAucqtq@mail.gmail.com>
In-Reply-To: <20110203120723.27025c31@ernst.jennejohn.org>
References:  <20110202195441.GA39963@freebsd.org> <4D49B8EA.4060904@delphij.net> <20110202210211.GM65811@acme.spoerlein.net> <20110203120723.27025c31@ernst.jennejohn.org>

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On Thu, Feb 3, 2011 at 3:07 AM, Gary Jennejohn
<gljennjohn@googlemail.com> wrote:
> On Wed, 2 Feb 2011 22:02:11 +0100
> Ulrich Sp=C3=B6rlein <uqs@spoerlein.net> 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=3D2048 finished after:
>> > >
>> > > 4676648960 bytes transferred in 1639.108763 secs (2853166 bytes/sec)
>> >
>> > Just curious - how will recoverdisk(1) perform? =C2=A0I 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).
>>
>
> And are these hacks available to the general public somewhere?

I think recoverdisk already support using DIOCGSECTORSIZE to obtain
underlying sector size and I don't think it's really needed to hack
it?  I think, maybe uqs@ mean one need to "hack" the CAM subsystem to
make the system believe that DVD have sectorsize of 2352 bytes for
some special purpose backup?

Cheers,
--=20
Xin LI <delphij@delphij.net> http://www.delphij.net



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