Recovering Data

when I was backing up data onto a CD-R, I accidently push yes to the question regarding whether to add the volume as new. Of course after it is done burning the data on, the old stuff, I can't no longer "see" with the explorer. But when I try the import secession button, it reads the cd and the files that disappear shows up, anyway I can get it back?
LVL 1
alienyzAsked:
Who is Participating?
 
jhanceConnect With a Mentor Commented:
The good news is that the data is still there.  The bad news is that the directory information, while still there, has been superceeded.

A CD-R is organized like this:

[allocated space for directory][data space]

After you write a few files it's like this:

[XXXX-------][DDDDDD----------------]

Where X is directory information and D is your data.  When you write more to it you get:

[XXXXYYY----][DDDDDDDDDD------------]

Where Y is new directory information.  When you create a NEW volume it sets a flag in the directory that tells the filesystem that all earlier directory information is invalid.  So you get:

[XXXXYYYFZZ-][DDDDDDDDDDNNNNNNN-----]

Where F is the flag and ZZ is the new information.  The data is now N and D is invisible.  But since this medium is WRITE-ONCE, the original X, Y, and D are still inplace, the problem is that the filesystem won't "see" it as it's been marked as not in use.

I think that there are some applications that can help recover the data.

If you use Adaptec software, this procedure can be used:

http://www.adaptec.com/support/advisor/discwizard/multinotlinked.html
0
 
kenboCommented:
Looks like you are SOL :o(
The only files that you will be able to access now are the "new" files because the CD, and more importantly the table of contents have been changed. When you clicked "new" it was just like putting a new CD in.

The only reason why the old contents are showing up is because the software is programmed to do that. Despite that fact, the info is non-recoverable.
0
 
alienyzAuthor Commented:
That is what I think, but after seeing software that was able to extract files that I delete with the recycle bin in win98. I think that there might be a program out there that can recover it, or atleast let me copy it onto the hard drive.
0
Evaluating UTMs? Here's what you need to know!

Evaluating a UTM appliance and vendor can prove to be an overwhelming exercise.  How can you make sure that you're getting the security that your organization needs without breaking the bank? Check out our UTM Buyer's Guide for more information on what you should be looking for!

 
LucamaxCommented:
Some recovery software work without looking at the TOC of the drive but directly on bytes written on it.

Think that Lost & Found from Powerquest may be ok for you. (there is a demo version available ).
If you will have problems because it is a cd you will have to create a copy on a directory of your hardisk.

0
 
alienyzAuthor Commented:
ok, I am going to give that a try. God I hope it would work, I save some important files on there...foolishing believeing that when it is on a CD it wouldn't be deleted
0
 
alienyzAuthor Commented:
THANKS A WHOLE LOT jhance. Thank god I was able to recover those files. once again thanks a lot.
0
 
jhanceCommented:
Glad it worked out!  BTW, here's a tip that I use, rotate your CD-R or CD-RW backup disks so that each time you make a backup you are using the next disk in a series of 2 or 3.  That way your last good backup is never in the drive.  With the low cost of CD-R blanks (I got a spindle of 100 at Staples for $59.95), there's just no excuse....

With either CD-R or CD-RW it _IS_ possible for the data to be obliterated by the write beam.
0
 
alienyzAuthor Commented:
thanks a lot for the tip. I make sure it wouldn't happen again.
0
All Courses

From novice to tech pro — start learning today.