Before you use Photo Recovery to recover lost data, you must keep in mind a very important rule:

DO NOT MAKE ANY CHANGES TO THE DISK ON WHICH THE LOST DATA IS LOCATED (the Bad Device).

The success of your data recovery depends largely on your adherence to this crucial rule. When we say to make no changes to the damaged disk, we mean that you basically should leave the disk alone. This includes the following:

Do not try to delete folders or files from the Bad Device, even if you are able to see them and think that they are not damaged.

Do not try to save anything to the Bad Device.

Do not attempt to format or re-partition the Bad Device, not even with a program like FDISK or format. If the support people for these or any other applications tell you it's OK to format or re-partition the Bad Device, do not listen to them.

You will risk permanent data loss if you do not heed these warnings. If you already have made one of these mistakes, don't worry. Just don't make any more changes to the Bad Device. You can use Photo Recovery free to see if your data is still recoverable. And even if Photo Recovery can't detect your Bad Device, all is not lost. If your Bad Device is HDD, It is not detectable by computer's BIOS. It's URGENT for you to turn off the power of the device immediately! You will not be able to recover the device with any commercially available utilities, and you should consult a professional data recovery service provider.