OVERWRITTEN data cannot be recovered, as it has been physically (electronically) replaced with something else.
Dr. Peter Gutmann (University of Aukland, New Zealand) wrote a paper on this around 1996, when HDD technology was very different. His paper only referred to electro-mechanical hard drives, rather than solid state drives that use transistors as opposed to magnetic media.
You can frequently recover "deleted", or "lost" data because it is still physically present; however, once it has been overwritten (replaced) with something else, it is GONE FOREVER.
None of the snake oil products suggested by spammers can do a thing about that!
September 3rd, 2013, 12:28 AM
Recurva work fine, as long as it has not been overwritten.
Memory sticks and SSD because of their size get overwritten fast.
September 6th, 2013, 12:10 AM
I agree with Shay, and put Piriform's "Recuva" on all my customers' machines. It does what it says on the box :D
I believe you to have far greater technical knowledge than myself, so this is a discussion point rather than an argument.
I have recovered stuff from solid state media that I would not have expected to from their electro-mechanical counterparts?
I put this down to the fact that the SSD stuff has software embedded in it to make all the transistors get used, rather than the next available?
What is your opinion?
September 17th, 2013, 12:54 AM
I figure between the two of us, we make a great team knowledge wise. We have both pulled stuff out of the wood work that surprised the other.
The SSD programing [ lack of a better word] Seems to delay over writing of items marked for deletion. So yes, you would be able to normally recover more. Remember we do NOT defragment SSD which can be a huge bacon saver.
Remember IDE/SATA writes to the first open/marked to overwrite areas first.
Hope that makes sense.
October 3rd, 2013, 08:58 AM
thanks, I like free tool which is really helpful.
October 7th, 2013, 12:46 PM
Even the overwritten files are not recoverable, but you never know whether the files are really overwritten, so you better try some free tool to check whether the files are still recoverable. Here's one useful guide: how to recover data from sd card
November 15th, 2013, 08:03 AM
All lost files are still on you SD Card,you can recover them with a SD Card Data Recovery, it will search your SD card lost files. Photo Recovery tool (compatible with Windows 8/7/Vista/XP) and Photo Recovery for Mac, the recovery tool can recover pictures, videos, music and other lot data from SD card easily.
November 15th, 2013, 08:04 AM
e you've deleted a file, DON'T TOUCH ANY other file on that drive. That's because, when you delete a file, it's not really erased from the drive, instead, what the operating system does is to erase the "index" entry for that file (the location on the "drive map" where the actual file is located),