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yottabit
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Joined: 11 Nov 2002
Posts: 313
Location: Columbus, Ohio, US
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 Posted: Sat Mar 13, 2004 12:57 am Post subject: Help Creating ISO of Troublesome CD |
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Hi Guys,
I'm trying to create an ISO dump of a printed CD for backup. I'm doing it like I have every other CD before this, but this CD seems troublesome.
| Quote: | | dd if=/dev/cdroms/cdrom0 of=./cd.iso bs=2048 |
The drive acts like it's having a problem reading it, then after dd reads so many records, it bombs with an I/O Error.
By the way, if I mount the CD, I can read/copy all the files fine. It only seems to have issues when trying to do a raw dump...
I've also tried two different drives. One being a Plextor 40x CD-RW over ATAPI, and the other being a brand new Plextor DVD-/+RW over ieee1394 (firewire). (The second drive is ATAPI mounted in an external ieee1394+usb2 enclosure.)
Any suggestions to help? Maybe a different program than dd? Or perhaps some exotic options to pass to dd?
Cheers,
J
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Vaughn
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Joined: 28 May 2003
Posts: 33
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| Posted: Sat Mar 13, 2004 1:00 am Post subject: |
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Sounds like it's "copy-protected"; it has bad blocks, but the ISO filesystem doesn't reference them.
Nope, no way that I know of to recreate that; however, if you're just interested in the data a simple "cp -av" should do.
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yottabit
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Joined: 11 Nov 2002
Posts: 313
Location: Columbus, Ohio, US
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| Posted: Sat Mar 13, 2004 1:23 am Post subject: |
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Ah, I was afraid of that.
It's Need for Speed Hot Pursuit 2. I always make an ISO backup of my games because they tend to get scratched up easily as you go to network parties and such you know.
Copying the data is okay, but I think that if there is indeed copy-protection via purposefully created bad blocks, simply writing the data to a CDR will probably cause the application to stop in its tracks...
J
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yottabit
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Joined: 11 Nov 2002
Posts: 313
Location: Columbus, Ohio, US
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| Posted: Mon Mar 15, 2004 4:34 pm Post subject: |
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I used cdread with the -clone option. It seems to have read through the errors, but the resulting ISO is quite large: 790,256,016 bytes (754 MB).
Would they have actually shipped an "over-burned" printed CD? Or is this extra size a result of reading through the errors on the disk somehow?
J
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Jake
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Joined: 31 Jul 2003
Posts: 1132
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| Posted: Mon Mar 15, 2004 7:19 pm Post subject: |
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| I haven't used cdread, but 754Mb may be reasonable depending on the format. For example, I've never had trouble burning ~800Mb bin/cue images (supported by cdrdao) on 700Mb CDs. |
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hamsta
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Joined: 16 Dec 2003
Posts: 8
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| Posted: Tue Apr 13, 2004 12:12 pm Post subject: Re: Help Creating ISO of Troublesome CD |
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try adding the option for continued read, even after read errors:
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dd if=/dev/cdroms/cdrom0 of=./cd.iso bs=2048 conv=noerror
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or try to decrease the block size
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