Many smaller images/videos are recovered from a formatted drive, except one specific big video larger than 2 or 3 GB
A 60 GB external USB drive was formatted by someone. I copied the bytes one-by-one by dd command to a file and named it backup.dd file. Then I used photorec to recover the files. Many smaller files are recovered except one specific big mpeg video.
The strange thing is that the largest recovered file is a swf flash file of 1.6 GB in size which shouldn't be there. Nobody remembers such a file. That's strange.
Anyways, what else can I do to recover the missing file?
UPDATE
The missing mpeg video which is not recovered by any tool, should be the largest one. It should be larger than 2 GB or 3 GB.
Looks promissing
The Wondershare Recoverit software suggested by the accepted answer is actually showing me the big videos which I was looking for. I'm seeing them, but I cannot push the recover button since I didn't purchase the software yet. It looks promising:
This might not be practically doable. What has likely happened is the file has been dispersed over multiple parts of the disk, with the filesystem being used to link the parts. This indexing has likely been destroyed when the file system was formatted.
Photorec and similar work by looking for file signatures and then reading as much as they can. This works well for images and videos where there is no fragmentation but breaks down where the file is fragmented.
In order to further your endeavours you have the very difficult (almost impossible) task of finding the missing fragments and reassembling them. It may depend a bit on the format of the mpeg video, but if its a highly compressed format, there are likely to be very few, if any, markers to help with this.
I've never tried it, so its not a recommendation but the advanced version of Wondershare Recoverit purports to be able to scan, match and merge video fragments. The reviews seem to indicate its legitimate, but be careful of automatic rebilling of your credit card each month if you don't cancel.