*.dad files

Using PhotoRec to recover lost data
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jayj
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Joined: 30 Apr 2014, 17:25

Re: *.dad files

#11 Post by jayj » 09 May 2014, 10:09

ok sent you 2 files
1. test.rar original dvr file (Brand Name Micae)
2. f7672373.rar - this is a recovered file where 2 videos are merged stitched together.

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cgrenier
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Re: *.dad files

#12 Post by cgrenier » 11 May 2014, 11:43

Can you send me 1 or 2 more original dad files ? I need to find more information about this file format. What is the brand of your DVR ?
Looks like I will need to develop some code to deal with this file format instead of a signature.

jayj
Posts: 12
Joined: 30 Apr 2014, 17:25

Re: *.dad files

#13 Post by jayj » 12 May 2014, 08:17

ok I will, send a few more
the DVR brand is Micae
can it be that the dvr is keeping files in a different format and then when you export them they are in a different format
in order to export, you specify a time frame and it exports the files in such frame
I sent one 500MB files which is exactly 1 hout of video.

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cgrenier
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Re: *.dad files

#14 Post by cgrenier » 12 May 2014, 20:46

I have uploaded a new 7.0-WIP. Can you try it ?

jayj
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Re: *.dad files

#15 Post by jayj » 13 May 2014, 08:53

ok will try today
should I add the photorec.sig or is it already in there?

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cgrenier
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Re: *.dad files

#16 Post by cgrenier » 13 May 2014, 19:22

No don't use this time the signature file. I have added some C code to deal with this file format.

jayj
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Joined: 30 Apr 2014, 17:25

Re: *.dad files

#17 Post by jayj » 14 May 2014, 11:57

unfortunately it is again thousands of small files
but the dad files starting at the same sector are with different size now

for example f7611397.dad was 4249kb in the previous recovery, the same file is 897 kb now

when I open them I think this time all files contain only 1 cam, so I think you solved the cam merge
but now the remaining part of the files are gone

An example of the files from a certain sector to another sector are as attached.
From 7600308 to 7633582
Old recovery recovers 9 files of 16.8Mb
New recovery recovers 6 files of 3.97Mb

Also the recupdir directories are different as you can see above
Attachments
oldrec.png
oldrec.png (182.56 KiB) Viewed 1908 times
newrec.png
newrec.png (192.48 KiB) Viewed 1908 times

jayj
Posts: 12
Joined: 30 Apr 2014, 17:25

Re: *.dad files

#18 Post by jayj » 15 May 2014, 09:16

wow I had left this recovery open and it's been 24 hours and there is still 27 hours remaining 122.000 files recovered

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cgrenier
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Re: *.dad files

#19 Post by cgrenier » 16 May 2014, 08:04

There may be a fragmentation problem if the video recorders opens simultaneously a file by camera, stores a frame for each camera and loops. Without some disk layout knowledge I can't help you anymore.

jayj
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Joined: 30 Apr 2014, 17:25

Re: *.dad files

#20 Post by jayj » 16 May 2014, 09:17

Ok thank you very much for everything.
I will try to mix and match what I recovered, thank you :)

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