Date: Sun, 15 Apr 2001 19:30:31 -0700 From: Robert Clark <res03db2@gte.net> To: Kal Torak <kaltorak@quake.com.au> Cc: Ben Smithurst <ben@scientia.demon.co.uk>, FreeBSD-questions <freebsd-questions@FreeBSD.ORG> Subject: Re: Creating EXACT image of a CD Message-ID: <20010415193031.A42447@darkstar.gte.net> In-Reply-To: <3ADA30B7.910C3921@quake.com.au>; from kaltorak@quake.com.au on Mon, Apr 16, 2001 at 09:37:27AM %2B1000 References: <3AD68EBA.EC6A8380@quake.com.au> <20010413135052.H75296@scientia.demon.co.uk> <3AD80DD3.7CA90D11@quake.com.au> <20010415220524.A41165@scientia.demon.co.uk> <3ADA30B7.910C3921@quake.com.au>
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Some copy protection schemes introduce intentional errors on the master. Many CD-ROM drives fix the error before passing the data on. I would think that using dd to copy these sort of discs would not produce an identical copy. [RC] On Mon, Apr 16, 2001 at 09:37:27AM +1000, Kal Torak wrote: > Ben Smithurst wrote: > > > > Kal Torak wrote: > > > > > I never like to use the original cd, I always use a backup... > > > But it wont let me, do you have any idea how it knows its different > > > from the original and how I can fix that? > > > > no idea, sorry. > > > Yeah no problem... I think they must do something to a sector on the disk > so that its not readable, but there is no data there, and somehow it checks > for this to make sure its the real cd... > > using dd you get all the data, but it doesnt copy the special sector, infact > it seems to cause dd to ether generate and error or go into a read loop that > it wont get out of even with a kill -9... > > There must be some tool that can just make an image, even of whatever tricks > they do with sectors... Its so damn annoying not being able to make working > backups of cd's these days! > > In my country its a consumers right to be able to make a backup copy... They > seem to be making it very hard to use this right... > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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