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can i delete a file from a normal cd?

sir,
can i delete a file from a cd-r. it should not be cd-rw.
if i can delete a file from a cd-r, from where can i get the information about a deleted file.
for example, can i retrive the information from a particular sector or something like that.
expecting a help at the earliest

regards
reshmi
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reshmi_cgnr
Asked:
reshmi_cgnr
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1 Solution
 
sunnycoderCommented:
Hi reshmi_cgnr,

no you cannot delete/add anything from a cd-r .. cd ROM by itself implies Read Only Memory ... however, you may loose data due to damage to the surface of CD ... in such eventuality, you need it send it to some professionl dat recovery service

Cheers!
Sunny:o)
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chicagoanCommented:
You'd have to copy the CD to your hard disk, delete the file and burn a new CD.
While you can write multiple sessions to a CD-R, once a session is written you cannot change it because the way the media works, the changes the laser makes are not reversible.
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LoosePantsCommented:
Wat sunnycoder say is true... You can't delete any files from a cd-r. That can only be done with a cd-rw. And if you have deletedany files froma cd-rw, its quite impossible to retrive it... However, you can try some recovery tools but I think that only works on hard drives. I personally have never tried it on a cd.
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LRI41Commented:
While it is true that you cannot actually delete files from a
CD/R, whilte in a burning mode, if you select a particular file or files and choose delete, the burning mode will make is so
you can no longer see or read the files, i.e delete them, but
you can no longer re-write on that space, such as you could on
your hard drive.  If per chance you have inadvertantly done this
to one or more CD/R you might try one of the following
to see if it could be retrieved.  I haven't tried any of the following,
but there have been good things posted about Isobuster.

LangaList Plus HTML Edition 2003-02-13  
Date: 2/13/2003 1:55:03 PM Pacific Standard Time


Data Recovery
Free "Unstoppable" Copier

Fred, I came across this interesting freeware which your readers may find helpful: Roadkil's Unstoppable Copier.
The author writes: "This program is great for recovering files from scratched CDs or defective floppy/hard disks. Normally when your computer is unable to copy a file from a damaged disk it will abort and delete the portion of the file it has copied. This program however will continue to copy the file right to the end. Any data that is not recoverable after many retries is replaced with blanks. This will allow you to truly recover every byte of information that is available for recovery. The program allows you to specify a single file, a group using wildcards (* and ?) or if you wish, select a starting folder and the program will copy all data from it and any sub folders it may contain. This program doesn't just need to be used for copying files form defective disks, it can be used to transfer any files!"
It's at
http://homepages.ihug.com.au/~roadkil/
  ---Bruce Fraser.
Thanks, Bruce. That could be a lifesaver!
http://homepages.ihug.com.au/~roadkil/

This program is great for recovering files from scratched CD's or defective floppy/hard disks.   Normally when your computer is unable to copy a file from a damaged disk it will abort and delete the portition of  the file it has copied.   This program however will continue to copy the file right to the end.  Any data that is not recoverable after many retries is replaced with blanks.  This will allow you to truely recover every byte of information that is available for recovery.   The program allows you to specify a single file, a group using wildcards (* and ?) or if you wish, select a starting folderand the program will copy all data from it and any sub folders it may contain.  This program doesnt just need to be used for copying files form defective disks, it can be used to transfer any files!
http:/ / www.bootdisk.com/ 050 10/20/2002

The BootLIST

Welcome to the 50th edition of The BootLIST
3) Can I Recover Data From My CDRW Disk?

andrew.e inquires - Is it possible to recover data on a cdrw
disc? Data is still on disc but drive will no longer read it!
Should I try on another computer, or is data lost forever?

kencraggs1955 replies:
Try the software from

www.isobuster.com

http:/ / www.smart-projects.net/ isobuster/

which is free to try and
can recover files, etc from sections which aren't physically
damaged.

*** Of course I'd try the disk on another PC first. There's
always the chance that your CD drive has gone bad.

Here's the link to ISOBuster 1.4 downloadable:

 http://www.isobusterdownload.com/isobuster_14_eng.zip

WinIce can also make a snapshot of memory while ISOBuster reads the file(s), if you can't save to disk as an option.

langalist] LangaList Standard Edition 2003-07-28  
Date: 7/27/2003 9:17:39 PM Pacific Daylight Time

4) "The Ultimate CD/DVD Data Recovery Tool"

Reader George Davis found an interesting tool with several uses---
including digging files off CDs you might not otherwise be able to read!

     Hi Fred, All of this talk of backups made me wonder why I'd
     never seen a mention of this tool. Maybe I'd just missed it, so
     I searched my updated LL Archives, and it didn't come up there
     either.

     Background: I suspected my old Win95 machine was getting ready
     to die, so I made plenty of backups, right onto CD-RWs (so easy
     to drag-n-drop, dontcha know?). I admit it I don't know much
     about CDs, they're just big backup media, with lots of quirks
     compared to floppies and Zip Disks. So, here I am safe in the
     knowledge that I have plenty of backups.

     I also had some regular CD-Rs, but 1 out of 2 turned out bad,
     still don't know why (I suspect software/hardware conflicts w/
     that old machine).

     So I get me a fancy-schmancy new WinXP system.... And you
     guessed it--- that new computer doesn't read UDF-whatever CD-
     RWs. On a chance, I went googling, and stumbled upon IsoBuster.
     Pure serendipity.

     Google took me to good ol' Shell Extension City, where I found
     the following description:

     "IsoBuster : The Ultimate CD/DVD data recovery tool! Rescue
     lost files from CD or DVD! Save important documents, precious
     pictures from the family, your only system backup, ...
     IsoBuster can do it all !.... IsoBuster lets you explore a CD's
     File System while by-passing Windows. This way you get better
     Error handling and several retry-mechanisms to aid you in
     getting the data anyway. More CDs stay 'readable' after
     problems (such as Buffer Underrun). Read and extraction of
     files, tracks and sessions from CD-i, VCD, SVCD, CD-ROM, CD-ROM
     XA, DVD, DVCD. Mpg (*.dat) Extraction and dat2mpg 'in one'.
     ISO9660, Joliet, Romeo (Short File-names <-> Long File-names on
     mastered CDs). Big Endian (Motorola), Little Endian (Intel)
     (The File System Windows sees vs. what Unix, Mac and other
     systems see). UDF 2.01 but also UDF 1.02 (e.g DVDs), UDF 1.5
     (e.g. Packet writing on CD-R and CD-RW). Rock Ridge Support
     (e.g. for Commodore users). Single sector extraction. File
     system properties (must for FS developers). Neat features the
     OS doesn't offer. CD-Text support.....(free)"

     Unfortunately, what the above system doesn't say is that the
     UDF support is activated only by a $20 registration, but as far
     as I can tell, everything else is free. But that $20 was the
     2nd best money I've spent for my computer (LangaList Plus being
     #1, of course! <g>).

     And it also read my previously unreadable CR-R's, not 100%
     recovery, but close enough (with redundancy, I have 100%, just
     have to sort it all out).

     I highly recommend IsoBuster in the free version. If the paid
     features are needed, registration, in my case, took less that
     15 minutes.

     Give it a look, and if you agree it's a keeper, pass it along
     to everyone else.

     Thanks for keeping us well-informed. ---[<G>eorge]

Nice find, George, thanks! It's an unusual tool that started as freeware,
and so all the original features are still available for free. But the
later features are shareware; you do have to pay to use them.

A full description and download link is available at

http://www.smart-projects.net/isobuster/





BadCopy Pro from BadCopy Pro if the disks are actually damaged.


http://www.jufsoft.com/badcopy if the disks are actually damaged.


Undo The Damage
Recover Files From Floppy Diskettes & Optical Media

http://www.smartcomputing.com/editorial/article.asp?article=articles%2Farchive%2Fr0504%2F53r04%2F53r04%2Easp&&searchtype=0&WordList=scratched+CD


How To Recover Data from corrupted cds

Comment from philby11
Date: 11/07/2003 08:33PM PST
 
Most dvd/video rental shops have professional 8 stage cutting machines that will remove all scratches that dont go through the disk.
My local guy charges $2 for the service.(not bad considering it takes about 20 mins)
It has worked for me on clients DVD's & CD's 100% of the time, unless like i say there is a hole.



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chicagoanCommented:
>its quite impossible to retrive it... However, you can try some recovery tools but I think that only works on hard drives.
recovering deleted files on CD-RW and DVD-RW currently requires customized hardware
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ajundraCommented:
you can virtually delete files on a cdr that's not finalized. if a session is written and the cd is left open you have the possibility to write another session and add or delete files in the directory of the cd. usually the last session's directory is loaded when you access a cd. if you removed a file from the directory when burning the second session, you'll not see it in explorer. but there are several tools that enabe you to switch sessions when accessing a cd. nero has an imageselector built in and cdrwin too as i know. switch to the first session to access deleted entries.

nem
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reshmi_cgnrAuthor Commented:
sir
suppose that i have deleted some files from a cd-r and then i have created an image of such a cd-r. then while doing an analysis of such an image file, how can i identify deleted file(or how can i say that a particular file is deleted). i have heard that some softwares helps in identifying deleted files. what is the technology used in identifying such files?
please help

regards
reshmi
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LRI41Commented:
what is the technology used in identifying such files?
please help

Personally, I take that query as a different question than that
which you originally posted, i.e.

can i delete a file from a normal cd?
 
But I wouldn't know anyway.
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ajundraCommented:
let say you've created the image copying the cd to your hdd with nero burning rom. you can now load the image with nero's image drive. it'll behave exactly like the original cd. you can browse it in explorer and also switch between the recorded sessions. you'll have to compare the content of every session to see which files are missing on the last one. the last session is the one that's usually loaded in explorer. if the file doesn't appear there but on one of the sessions before, then it was deletet.

ok?
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ajundraCommented:
i forgot.. there are two fine tools you can use to view and edit iso images: winiso and cdmage. you can open every iso or bin image, examine it's contents and extract files or complete sessions directly from your image files.

with cdmage it's even possible to edit every single bit of the image. i use it to recover data from damaged cds because it can repair errors in bin images. it's definitely one of the best image editing tools available.
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sunnycoderCommented:
Hi reshmi,

>suppose that i have deleted some files from a cd-r
I would be very keen to know how you accomplished this...

I am assuming that you have made some error in copying the cd rather than deleting from it... Since you need to find the difference between the two versions, an iso explorer or likes are not likely to help unless you have small number of files and are willing to take up manual comparison...

If you have access to a linux box, then try this

mount old cd rom
ls -R oldcd > /some_directory/old_list.txt

remove it and mount new cd rom
ls -R newcd > /some_directory/new_list.txt

diff /some_directory/old_list.txt /some_directory/new_list.txt

this will give you the difference between the dir structures in the two (that includes the files )

if you do not have access to a linux box, download cygwin ... it provide the same functionality but is a heavy download (it simulates linux on windows ) ... I am sorry but I do not know much about windows scripting so can't make a windows script for you
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sunnycoderCommented:
Hi LucF,

Correct answer has been posted and question should be PAQed and points awarded. Whom to award the points, I would leave it up to you but this is definitely a "PAQ & award" candidate.

sunnycoder
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