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Over time, I had several cards with similar data which should have been grouped together. I made a folder on my desktop and named it 'From SD cards-To be sorted'. Then I transferred all the data from all the cards to this folder. That left all my SD cards 'empty'. At least that's what Windows said.
I started anew with one card and began taking pictures again. I had accumulated about 50 pictures on the card when I made a mistake. I accidentally deleted a picture. My intention was to rename the file. The 'Rename' and 'Delete' options in my context menu are one after another, so I make this mistake often. There is a free software that allows you to reposition the context menu options. I plan to download it and make use of it. Most deleted files are easily retrievable from the Recycle Bin. However, files from SD cards are simply deleted. They are not sent to the Recycle Bin.
The picture I deleted was one I had planned to submit to ThriftyFun and I did not have a copy. I went to the Internet and found several software for recovering data deleted from SD cards. I picked one that was free. It was an excellent software, very easy to use. It did have limitations in that it would only retrieve 1 GB of data for free. That was OK. A Gig is a lot of pictures and I was only interested in retrieving one among about fifty.
In very short order, the software retrieved not only the picture I accidentally deleted but hundreds more, hundreds I had 'emptied/deleted' from the card. All the pictures I had taken and deleted were still on the card. Had I not recently taken 50 more pictures, my computer would have shown the card as 'Empty', while this software showed it to contain hundreds of files.
If you have data stored on an SD card that you do not want to fall into the wrong hands, I can tell you, deleting the data is not enough. It is still retrievable, often even after the card has been reformatted.
There are free software available said to reformat an SD card in such a manner no data can be retrieved. We'll save that for another post.
Summation: When you think you have deleted all data from an SD card, you actually have not. If the card once held sensitive data, it more than likely still does. It would be wise to keep these cards in a secure place. And if you happen to give someone an 'empty' used card as a gift, do know that any data you once put on that card could still be retrievable.
Unless you are 'tech savvy' on 'wiping' SD cards, and they do happen to contain sensitive data, keep them secure or destroy them.
This is good to know as making a mistake like that can happen anytime so I'm glad to know there are programs to retrieve the deleted files (even free!). We have been using the same SD cards for a long time and we tend to buy new cameras that use the same type cards but it is good to know that we should destroy them if getting rid of one.
Good information, Doug. Just a clarification, as I work with memory cards and photographs all the time. I usually come from this problem from the other side, trying to restore images that were accidentally deleted or unaccessible due to card damage.
If the card was truly reformatted, all the information would have been trampled. It would not be recoverable, as the photo info was written over. My husband's Canon DSLR will restore his drives to the factory settings, making it entirely blank. He does this often, before a photoshoot.
If the card was not actually reformatted but the images were just deleted, the images might still be there and recoverable. But new photos taken over the top could easily trample a portion of the old images. There is no guarantee that you can ever recover something from a card after it has been used again.
I would be cautious with financial or personal information or any sensitive photos but, in general, if you delete something, it would be pretty hard for someone else to access it. There is probably more concern with files sent by email or stored on the cloud.
"If the card was truly reformatted, all the information would have been trampled. It would not be recoverable, as the photo info was written over".
I'm glad you brought this up. That is why if you accidentally delete a file and hope to recover it, it is important that you not add any more files prior to the recovery attempt.
As for the blanket statement 'the information would not be recoverable', I hope we can agree to disagree. I have accidentally reformatted a hard drive and recovered almost 90% of the data. How much data can be recovered depends on the reformatting method used, and there are many. Also, how much data can be recovered would depend on whether the data was overwritten by using the medium after reformatting and prior to attempts of recovery. Overwriting often leaves fragments of previous data, sometimes enough to be used as evidence in court.
I have used a military security type method as part of D-ban and the disk had no retrievable data left on it. Whereas when reformatting with Windows, I was able to, as I said, recover most of the data. Highly skilled technicians dealing with data recovery as part of forensics, recover 'unrecoverable' data all the time.
A few months back, I purchased a software for $75.00 called GetDataBack on the advice of Microsoft MVP technicians with TechSupportForum. I used it to recover data from a reformatted drive (reformatted in 'the usual' manner with no extreme methods used). I recovered all my data.