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dvd-rw data recovery
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Garald111
Newbie
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13. May 2008 @ 09:51 |
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basically we shot the last six months of our baby on a dvd rw on Sony handycam dvd 205 and while visiting my parents the wife asked if she could view footage on their LG RH7500 HDD DVD recorder.
So the dvd player reported back that it couldn't see the disc and to cut a long story short it got either initialised or reinitialised. (I werent in the room at the time so not sure) anyhow now the dvd appears to have been formatted or at least the files on it deleted. Anyhow to prove she did nothing wrong my mother recorded a couple of seconds footage on the dvd and popped it back in the LG and that clip appeared and played.
What I need to know is can the original footage be recovered and how much of a job will it be
Thanks
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AfterDawn Addict
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13. May 2008 @ 17:27 |
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Garald111
Newbie
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13. May 2008 @ 17:34 |
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Thanks attar
Although from what I've since read it would appear I might have more of a problem depending on whether the RH7500/7800 erase software works in the spirit of the DVD+RW standard. Meaning that the software doesn't issue a quick erase command but instead does the erasing by itself like it would on a DVD+RW where it doesnt wipe the disc it just overwrites it when it needs the space.
Perhaps someone in the DVD recorder forum may know?
Regards
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JoeRyan
Senior Member
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13. May 2008 @ 20:31 |
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If the DVD+RW was initialized or reformatted, the old table of contents was erased or overwritten. This can happen quickly--but the good news is that the files themselves still exist on the disc. They simply no longer have addresses.
Recovery software generally works by examining the files on a rewritable medium, whether it be a floppy disk, a hard drive, a flash drive, or a rewritable disc, and reconstructs the former table of contents by making up a new, temporary table. This is often good enough for the files to be transferred to another medium and recovered. If, however, new data were written to the disc after the disc had been formatted, it is possible the new data were written over old files and permanently destroying them. The only way to know is to use the recovery software to see if any of the old files can have new addresses written to them so that they can be transferred.
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Garald111
Newbie
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14. May 2008 @ 09:02 |
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Hi Joe
It was a -RW i was just hoping the LG DVD recorder used the +RW standard for erasing then as you say the majority of the data will still be there. However I am led to believe that some recorders still follow the old -RW standard that overwrites the whole disc.
i am awaiting confirmation from LG that this RH7500 follows the +RW standard
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Garald111
Newbie
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14. May 2008 @ 09:07 |
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or confirmation from anywhere will do...Anyone here know whether that LG RH7500 uses +RW standards.
Seemingly (according to isobuster site) if not it requires specialist hardware to recover the data
Could I make it any worse by having a go at retrieving the data myself?
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AfterDawn Addict
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14. May 2008 @ 09:25 |
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If it was DVD-RW, and it was not finalized on the cam, then it would not be usable on the LG.
If the LG user then formatted the disk, then I fear all is lost - you can record to the a DVD-RW multiple sessions before finalizing (closing) the disk.
On the other hand, my Panasonic uses a menu driven program to format disks, with many caveats and warnings before it happens - so I assume the LG is the same - i.e formatting is not something that can be done without notice..
Attempting to read the data on the disk will do no harm;no writing takes place to the DVD - only to the hard drive.
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Garald111
Newbie
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14. May 2008 @ 18:58 |
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Hi attar
I am afraid you are wrong about it not playing if not finalised because like I said in the original post
Originally posted by Garald111:
Anyhow to prove she did nothing wrong my mother recorded a couple of seconds footage on the dvd and popped it back in the LG and that clip appeared and played.
And it certainly wasn't finalised because I watched her do it.
Not sure how much of a formatting it got as I was out the room wife said it only took about 5 sec to initialise the disc
I have given Apex labs the details and they reckon they can do it but are quoting £175
Could I make it impossible to do by having a go first and failing?
Thanks
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AfterDawn Addict
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14. May 2008 @ 20:30 |
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I'm stumped;it contradicts page 56 of the users manual.
It says that a DVD-R or DVD-RW has to be finalized in the camera to make it usable in another device.
http://www.starbatteries.com/sohadcowmaus.html
If you take another DVD-RW and record something with the cam, then without finalizing, play it ok on a different device - the manual is wrong.
Further if that disk were inserted in that LG machine and it did in fact format automatically it would make no sense.If that was the case you couldn't play any -RW disks in that machine - it would format them.
My thought is that if the DVD wasn't finalized - it would be unusable in another player/recorder unless it was re-formatted - and formatting (inasmuch as it applies to my own Panasonic recorder) requires stepping through a menu and acknowledging that all data on the disk will be lost.
As to trying to recover the data yourself - I don't see how you can possibly cause any further data loss.None of the tools that I come across will attempt to write to the media.
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Garald111
Newbie
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15. May 2008 @ 05:57 |
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Hi attar
I don't think the LG formatted the dvd-rw automatically. I think it couldn't see the disc and offered the option to initialise it which my mother accepted (think she was confused with finalising it, she doesn't use it much other than aa a HDD recorder)
It was once the disc had been initialised in the LG that she removed it popped it back in the camera and recorded a couple of secs over the top of it, then put it straight back in the LG and it played. So maybe you are right and it was only coz it had been initialised in the player that it worked the second time without finalising in the camera
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AfterDawn Addict
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15. May 2008 @ 08:06 |
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I guess you could repeat the steps on another disk and see if you can recover anything from it before trying the original.
Good luck.
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Garald111
Newbie
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15. May 2008 @ 09:36 |
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Thats a great idea I'll try that, going back there tonight. I'll let you know how I get on
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Garald111
Newbie
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16. May 2008 @ 05:47 |
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Well I tried recreating the same scenario with another dvd-rw and found that not only did the LG DVD format it during initialisation the bloody camera formatted it also when I put it back in there. I had about 4 different attempts at recovery with CD roller before giving up, It couldn't find anything on the disc.
However it was noticed that the LG initialisation on my recreation took 6 miniutes as opposed to the 20 or so seconds that the original disc took. So I thought I would still give it a go. It took about a 15 minute scan but amazingly it found ALL the lost footage. As you can imagine I am absolutely delighted. The bit that was recorded over the top appears right at the begining of the footage but it hasn't overwritten anything important (if anything at all!)
They have been recovered as 2 unnamed .vob files (rather than the original .IFO ,.BUP and .MPEG)
Many thanks for all your help
Regards
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