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Corrupted CD


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#1 D.Kit

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Posted 13 March 2007 - 12:22 PM

Hi All,

I have a backup CD-RW that contains about 400 megs of pictures, word, excel, and powerpoint files. I dragged and dropped with Roxio 7  Drag-To-Disc.  The files worked fine for two months until I added several new files yesterday.  Now the CD is corrupt.

The Roxio Scan-recovery program locks up at the last step of copying the files from the CD to my C: drive.

Any suggestions, guys?

D.Kit.

#2 Beerman

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Posted 13 March 2007 - 12:26 PM

QUOTE (D.Kit @ Mar 13 2007, 03:22 PM) <{POST_SNAPBACK}>
Hi All,

I have a backup CD-RW that contains about 400 megs of pictures, word, excel, and powerpoint files. I dragged and dropped with Roxio 7  Drag-To-Disc.  The files worked fine for two months until I added several new files yesterday.  Now the CD is corrupt.

The Roxio Scan-recovery program locks up at the last step of copying the files from the CD to my C: drive.

Any suggestions, guys?

D.Kit.

I don't use D2D and many others don't for reasons such as what you  mentioned......just not worth it to me.
Since I'm not a packet app user, I'm not sure what can be done with EMC (if anything) but you may want to give CDRoller at try.
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#3 grandpabruce

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Posted 13 March 2007 - 12:46 PM

You can also try ISO Buster, but it, and CD Roller are not free.  From now on, use Creator Classic and a CD-R.  They cost about $0.15 each.
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#4 lynn98109

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Posted 13 March 2007 - 02:14 PM

You have made the classic mistake I call "Basic False Analogy" - that since you format the floppy before using the floppy, therefore you format an optical disc (CD, DVD) and then use it.  However, unlike magnetic media, optical media uses small depressions (pits) and flat places (lands) in the recording layer,  for the equivalent of 0's and 1's.

And RW media is erasable because the recording layer isn't stable.  If not erased, it will tend to flatten out (and become unreadable) on its own over time.

So you have the classic result.  Bruce and Paul have given the two standard answers.  However, there is more detail here -
http://forums.support.roxio.com/index.php?showtopic=12382

If its any consolation, I managed to learn the hard way, despite being warned by my software guru.

Let us know how it goes.

Lynn

#5 D.Kit

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Posted 15 March 2007 - 06:29 AM

Thanks, folks.

CD Roller seems to work for me. I paid for it and have already recovered about 95% of files. Got a valuable lesson... Will migrate to "R" discs and use "Session at once" software

Thanks again.

D.Kit.

#6 lynn98109

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Posted 15 March 2007 - 06:37 AM

QUOTE (D.Kit @ Mar 15 2007, 07:29 AM) <{POST_SNAPBACK}>
Thanks, folks.

CD Roller seems to work for me. I paid for it and have already recovered about 95% of files. Got a valuable lesson... Will migrate to "R" discs and use "Session at once" software

Thanks again.

D.Kit.

Congratulations, and thanks for letting us know.

(The saddest ones are those who have nearly filled a DVD/RW with small files when it blanks out sad.gif)

Lynn

#7 d_deweywright

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Posted 20 March 2007 - 04:53 AM

QUOTE (D.Kit @ Mar 15 2007, 10:29 AM) <{POST_SNAPBACK}>
Thanks, folks.

CD Roller seems to work for me. I paid for it and have already recovered about 95% of files. Got a valuable lesson... Will migrate to "R" discs and use "Session at once" software

Thanks again.

D.Kit.

Technically, it's just writing "sessions" or multi-sessions.  Session-At-Once is a specific term for writing multiple tracks (not files) without turning off the laser, like Disc-At-Once, but without closing the disc.  That option appears to have been dropped from EMC since around EMC 7, unless I just haven't found it.

Edited by d_deweywright, 20 March 2007 - 04:53 AM.

Dave D-W

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#8 Richard Fdisk.exe

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Posted 08 April 2007 - 09:33 AM

QUOTE (d_deweywright @ Mar 20 2007, 04:53 AM) <{POST_SNAPBACK}>
Technically, it's just writing "sessions" or multi-sessions.  Session-At-Once is a specific term for writing multiple tracks (not files) without turning off the laser, like Disc-At-Once, but without closing the disc.  That option appears to have been dropped from EMC since around EMC 7, unless I just haven't found it.



we've got the stripped down EMC "Roxio Creator LE Dell Edition" and the settings can be chosen by clicking on the Wrench icon at the bottom right corner;
it brings up the "Options Menu"
under the section titled "Data"
in there you can choose;
1) "I would like to use discs for more than one recording..." ► leaves the disc open for more sessions
2) "I only need to use discs for one recording..."  ► closes and locks the disc
(RW can be erased and used over but still remains locked until it's erased).
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#9 d_deweywright

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Posted 08 April 2007 - 04:23 PM

QUOTE (Richard Fdisk.exe @ Apr 8 2007, 01:33 PM) <{POST_SNAPBACK}>
we've got the stripped down EMC "Roxio Creator LE Dell Edition" and the settings can be chosen by clicking on the Wrench icon at the bottom right corner;
it brings up the "Options Menu"
under the section titled "Data"
in there you can choose;
1) "I would like to use discs for more than one recording..." ► leaves the disc open for more sessions
2) "I only need to use discs for one recording..."  ► closes and locks the disc
(RW can be erased and used over but still remains locked until it's erased).

Right, but there's a difference between Track-At-Once multi-session writing, which EMC 9 does allow, and writing Session-At-Once, which is done for Audio CDs, or CD-Extra discs, where you have multiple Audio Tracks written without turning off the laser, and then a Data Track written after the Audio tracks.
Dave D-W

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#10 D.Kit

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Posted 07 June 2007 - 09:53 AM

QUOTE (d_deweywright @ Mar 20 2007, 04:53 AM) <{POST_SNAPBACK}>
Technically, it's just writing "sessions" or multi-sessions.  Session-At-Once is a specific term for writing multiple tracks (not files) without turning off the laser, like Disc-At-Once, but without closing the disc.  That option appears to have been dropped from EMC since around EMC 7, unless I just haven't found it.


I've just found a new version of CDRoller (v.7) has a portable burn and erase options.
It looks like a solution for my current (backup) tasks. Will try...

Thanks,

D.Kit

#11 d_deweywright

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Posted 07 June 2007 - 10:34 AM

QUOTE (D.Kit @ Jun 7 2007, 01:53 PM) <{POST_SNAPBACK}>
I've just found a new version of CDRoller (v.7) has a portable burn and erase options.
It looks like a solution for my current (backup) tasks. Will try...

Thanks,

D.Kit

You seem to have missed the point above, that there is a very reliable way of writing files to CD-R using Easy Media Creator, which allows you to write to the disc multiple times, adding files each time.  Simply use Creator Classic, add the files you want, and when you go to burn the disc, uncheck the box that says "Read Only".  This will leave the disc (not the session) open and available for adding more files.  Writing files to disc this way is very reliable and safe for backup storage.  Anything that says "erase" implies using CD-RW (erasable) media, which is not considered by most to be a safe way to store information for long term storage.

Hope that helps!
Dave D-W

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#12 lynn98109

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Posted 07 June 2007 - 04:47 PM

I would go further and say RW media is an excellent way to permantly LOSE information.

You might find some interesting info in this:
http://forums.support.roxio.com/index.php?showtopic=12382

It applies to ALL RW media, all R media, and ALL Packet-Writing programs (Drag2Disc, Nero's InCD, Sonic's DLA, etc)

Lynn

#13 Brendon

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Posted 07 June 2007 - 05:09 PM

I would concur with Dave, that RW media are not considered by most to be safe for long-term storage. When used carefully they are perfectly fine for short-term work.

I think Lynn takes her aversion to packet-writing software and rewriteable media much further than the evidence will support.
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#14 lynn98109

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Posted 07 June 2007 - 05:27 PM

I was confident I had a "great-big floppy-disc", and even had some authoritative sources to back me up - I don't know if the Dummies books have changed since, but the one(s) I had said a formatted CD-RW was like a "great-big floppy-disc".  My software guru tried to warn me, but I managed to learn the hard way.

That's why I try to pass the info along.

BTW - I remember someone who bought cdroller, and assumed he could continue to use his CD-RW with cdroller and was extremely upset when cdroller could no longer retrieve the files.  If you get to the point you are using a recovery program, it's time to re-record - using R media (is your media worth as much as th cost of a new disc?) and a Sessions-based program like Classic Creator (or the older DataProject), or the built-in Windows burning.

Lynn

#15 Brendon

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Posted 07 June 2007 - 05:42 PM

"One swallow doth not a summer make."  The evidence of one personal calamity or even several, can't be used to totally condemn the technology.

That's faulty logic, and is even worse when it is repeated endlessly whenever RW or packet writing are mentioned.
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#16 TOTG

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Posted 08 June 2007 - 05:31 AM

I think Lynn has an aversion to assumptions made with the technology, not the technology itself.  If you aren't careful, Packet Writing software will screw you over.  However, it has its uses, such as convenience.

An interesting experiment; a couple of friends and I tried to force D2D to corrupt a Disc.  One friend unplugged his computer half-way through the burn.  None of us actually managed to get a corrupted disc in the end.

In general, I don't believe that you should only have one backup of important data.  This is where most problems lie.  If you only have one copy of it, then murphy's law is going to kick in, no matter what you have it written to.

#17 lynn98109

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Posted 08 June 2007 - 05:52 AM

If you make the backup with Packet-Writing, assuming you have a long-term backup, and set it aside for a few months -that's when it is likely to get you.

And I can speak from experience.

Lynn

#18 james_hardin

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Posted 09 June 2007 - 08:15 AM

QUOTE (TOTG @ Jun 8 2007, 09:31 AM) <{POST_SNAPBACK}>
I think Lynn has an aversion to assumptions made with the technology, not the technology itself.  If you aren't careful, Packet Writing software will screw you over.  However, it has its uses, such as convenience.

An interesting experiment; a couple of friends and I tried to force D2D to corrupt a Disc.  One friend unplugged his computer half-way through the burn.  None of us actually managed to get a corrupted disc in the end.

In general, I don't believe that you should only have one backup of important data.  This is where most problems lie.  If you only have one copy of it, then murphy's law is going to kick in, no matter what you have it written to.

I don't think you & friends tried too hard Use V9 and it will bite you very quickly! My Results
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#19 TOTG

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Posted 11 June 2007 - 06:10 AM

We didn't do as extensive testing as you did, just a few small things that we thought might screw up the writing process.  Also, I think we used V8, and R media, and we didn't store them for very long (about 10-15 seconds tongue.gif)  I'm not sure what media we used either, though that definetly can play into it.  
But anyways, I think this has gotten off topic now, so I'm not going to post any more in this thread after this.  PM me if necessary (Probably shouldn't be, but eh, thats your call)

#20 D.Kit

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Posted 21 June 2007 - 11:36 AM

I have just tried to read some files from old backup on my friend's computer.  CD-RW was burnt by Drag-To-Disc. When opening the text file, i get "This file is compressed and intended for use with Adaptec DirectCD 3.0 or later" with a lot of garbage symbols below, instead of normal text. It seems that D2D made
CD-RW inaccessible for another computer. Why???

Thanks,

D.Kit.

P.S. Fortunately, CDRoller seems to be able to retrieve all files off this "compressed" disc.




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