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Index > Heap > instruct cd-laser write/burn specific offset of closed disc

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idle



Joined: 06 Jan 2011
Posts: 359
Location: Ukraine
idle
hi
the disks are closed dvd-/+r
can you recommend a tool for doing that?
thanx
Post 15 Mar 2016, 17:15
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Matrix



Joined: 04 Sep 2004
Posts: 1171
Location: Overflow
Matrix
hi!

http://hackaday.com/2007/09/30/read-every-bit-on-a-dvd/
http://debugmo.de/2007/07/read-your-dvds-the-raw-way/

I have not seen any tool capable of doing that, cd and dvd writing tools are designed to make your life hard if you want to do anything with them, one could make an opensource dvd writer though that can be simply controlled by an opensource driver would be capable of writing whatever
Post 16 Mar 2016, 02:11
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17350
Location: In your JS exploiting you and your system
revolution
idle: Are you aware that you can't simply rewrite a sector on a DVD+R or a DVD-R disc? Once the sector has been "burned" you can't go back and refresh it. Even it you only want to change one bit, and you knew the exact bit, you still can't simply go and burn an extra hole (or whatever it does at the hardware level) because the encoding and ECC requirements will mean you have to generate a new sector, with new ECC bits, and rewrite the entire sector. You can't "unburn" a DVD+/-R disc, it would be like trying to unbreak a ceramic cup.
Post 17 Mar 2016, 01:03
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idle



Joined: 06 Jan 2011
Posts: 359
Location: Ukraine
idle
shure, crc will be wrong, in my case it does not matter, of course smbd may use the technique to protect his data, well i'mnt greedy for doing that
Post 17 Mar 2016, 11:04
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17350
Location: In your JS exploiting you and your system
revolution
idle wrote:
shure, crc will be wrong, in my case it does not matter, of course smbd may use the technique to protect his data, well i'mnt greedy for doing that
It is not a CRC. It is an ECC, so your bit will be treated like a normal error and be "corrected" thus undoing your change. But even so it is not that simple to target one bit, there is still the 14-to-8 encoding scheme to consider. Anyhow, you are still limited to "burning" each bit, and burning can only go in one direction for the DVD+/-R discs.
Post 17 Mar 2016, 11:13
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idle



Joined: 06 Jan 2011
Posts: 359
Location: Ukraine
idle
it is sad Sad
Post 17 Mar 2016, 14:56
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17350
Location: In your JS exploiting you and your system
revolution
Write a new DVD disc with whatever changes you need. What is so special about the one you have?
Post 17 Mar 2016, 15:33
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idle



Joined: 06 Jan 2011
Posts: 359
Location: Ukraine
idle
esp? : laziness (shame), curiosity
Post 17 Mar 2016, 17:06
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idle



Joined: 06 Jan 2011
Posts: 359
Location: Ukraine
idle
support@imgburn.com: No, the drive wouldn't allow such a thing


Thanks for replies.
Post 19 Mar 2016, 17:17
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