Instructables

Erase a dvd+R using software


Ok so we all know its possible to write a dvd+r up to the limit. (one time only of course) So if it can write data once, that why cant we have it ignore the data or headers and just write all 1's or just random garbage to the disk to destory it? It actually sounds cooler than breaking it...

If there is software than please provide a link (if its free/open source)

>Ok so we all know its possible to write a dvd+r up to the limit. (one time only of course)

There's your answer. No, you can't "erase" data on single-write discs.

To understand why, you need to understand what erasing files actually means. When you "erase" or "delete" files on your computer, what is actually happening is that the file's listing is being removed from the directory tree, and the occupied space reported as free for writing, but the data itself is still actually there (these actions in turn involve writing data to the disk). The "erased" data will become truly gone once it is overwritten by more data. (This is why it is possible to recover deleted files sometimes, and why, if you delete a critical file from a disk - not disc, which refers to a dvd/cd, but a hard disk - you should immediately shut down the system, and then image the affected disk and attempt recovery from that image on another system).

So to erase files from non-rewriteable media, you would have to...write to it! Which is tautologically impossible.
(Addendum: multiple sessions aren't to be confused with overwriting - it's true that you can "reuse" this type of disc and add more files in subsequent sessions, if it has free space, but you still cannot erase or overwrite the existing data; it will remain untouched. You can reuse the dvd if it has space, but you cannot reuse the actual location on the dvd to which data has been burned)
Um... no... you can't write more information to a DVD+R... DVD+RW can be re-written, but once you have finalized the DVD+R, you're done. (Assuming that you are mastering the disc... which is the whole point of using a disc as apposed to a Flash Drive.
Please reread my comment. I'm referring to multiple sessions, not overwriting.
OK, but once you have finalized a disc, you can not add data to it. Why anyone would use the "Live file system" that windows now offers, is beyond me. You might as well use a flash drive.
How is that relevant?
Because most people will be finalizing their disc. So you cannot add data to it once it has been finalized. By definition, a +r or -r disc cannot have any type of change once it has been written to.

My point is this:
If you want to use the disc effectively, you have one shot to write the data to the disc. Otherwise, you are not using the disc efficiently.
Citation needed. Even if most people will be finalizing their discs, that is utterly irrelevant to the technical point I was making.

Clarifying that multisession does NOT equal overwriting a dvd +r doesn't make me wrong (rather the opposite, in fact). I'm really confused as to why you're talking about finalizing when I'm talking about the exactly the opposite operation.

OK, multisession and multiple session actually mean two diffrent things... from your context I miss-understood you. I appoligize. Multiple session implies that you are using multiple closed sessions. (Like you would with an RW disc.) Multisession implies that you are leaving the session open for future additions. (Like a single session disc left open using microsoft's live file system.) Multisession is rather unstable, and pretty much good for nothing, whereas multiple session is pretty stable once the current session is closed.

Again, I miss-understood your context, I should have caught that you were talking about multisession. I appoligize again.

(I also appoligize for any spelling errors in this post. I'm on my droid, so I don't have spell check, and I'm a terrible speller.)
No problem. Conversations can get heated when talking about our passions, eh? :D
Yep! I do data recovery for my main income, so data structure is really big in my line of work! :)
Fascinating - I never have "met" someone with that job. :) Which program(s) do you find most effective?
I actually have access to programs that aren't avalible in the private sector... so the only program that I have used that is avalible to the public is pandora. It works ok for some purposes. And it's great since it's freeware. I mostly work in the clean rooms, and do more physical interaction than I do with software.
Ooo, hardcore. :D I have to be honest though, data recovery techs make me a little bit nervous even though I don't have the nuclear codes or anything like that. The concept of guys who can get your data whether you want them to or not is kinda unsettling...
Especially if they have access to stuff that isn't legal for most people to use... ;) But don't believe the TV shows... it really doesn't work the way they make it appear. I always get a kick when an officer or agent starts typing away at a computer... without adding a read only physical block in the data line. If I ever did that, I would be fired before I even knew what hit me... :)
Ahaha, yes. I love CSI, et al...when they start talking about computers it's quite painful to watch... (I assume you've seen the "I'll use visual basic to make a gui" clip? That's my favorite. :D )
No, actually, I don't regularly watch CSI... I'm more of an NCIS guy myself... but that clip sounds interesting... do you happen to know where I could watch it?

Pretty much any TV show is pretty funny to watch when they start talking about IT stuff... mostly because their technical advisers are AV guys. Nothing against AV guys... it happens to be a hobby/passion of mine, but most AV guys only have a basic understanding of IT. (IT guys generally don't even know the first thing about AV either... so I'm pretty rare...) :) I was fixing a computer for an AV friend of mine... he couldn't remember that BIOS password... so I took out the RTC battery, and he started freaking out telling me that it was going to destroy the computer and blah blah blah... needless to say he was pretty surprised at how quickly I was able to reset the bios settings... :)
I don't regularly watch it either; I just catch reruns sometimes and trawl youtube for replays of the horrible computer moments. The video is here http://www.youtube.com/watch?v=hkDD03yeLnU and my second-favorite one (about IRC) is here http://www.youtube.com/watch?v=O2rGTXHvPCQ . Honorable mention goes to Burn Notice the other night when one character assured the other they'd "be on bluetooth" if anything came up.

 Do you like IT crowd? It's the ONE show I've ever seen that isn't heart-breakingly wrong about computers (and it ought to be accurate, given that it's about IT staff...). Ahahaha, why did he think that would hurt anything? I can't figure out that one, unless he just thought you were snapping random bits off - guess it is hard to cram your mind back into that of a noob AV guy. :D
I've never seen IT crowd... but it should be accurate from the sound of it! :) He was thinking that I was going to mess up the bios... which at one time was true. On some of the first computers it would do some damage if you removed that battery for a long enough time. Actually he is a very good AV guy... he's even better than I am at AV, he's just not a IT guy. ;)
Weellll you could overwrite on the disk with a sharpie... but its not very effective at eraseing the other data.

(sorry I couldn't resist)
>rolls eyes<

Not THAT kind of overwriting. :p
It actually sounds cooler if you just use a blowtorch or jackhammer to destroy the dvd.
thegeeke2 years ago
No. Once a disc is finalized, you cannot digitally change the data. (Unless you have DVD+RW.)