Connect your device to a computer to access the data, instead of view data on the device directly.
Use a card reader for accessing the data on a computer or try with another data cable.
If using card reader doesn't work, you need to check the card for errors. It is possible to check media errors using Disk Repair utilities, such as chkdsk in Microsoft Windows and Disk Utility in Mac OS X operating system.
If the above steps fail to solve your problem, you have no option but to go for formatting, and start memory card recovery immediately.
No matter what kind of memory card errors makes you lose data from your card, you can find it back with third party memory card recovery software. Memory card recovery software can scan logical damaged memory card and recover the data.
As a Mac user, you can use uFlysoft Data Recovery for Mac, which can recover deleted, formatted, lost and inaccessible files including images, videos and songs from Mac, memory card and other storage media.
Use Data Recovery for Mac to Get Back Files
Once you choose the data recovery tool we mention above-uFlysoft Data Recovery for Mac, it can help you to get back deleted files from memory card on Mac with ease. Just follow the easy-to-use "3-step" operation below.
First of all, install the application on your Mac. (Worry about the fee? No need to do so. uFlysoft Data Recovery for Mac is free download/free scan application.)
Secondly, start scanning where the lost files were stored before after launching the program.
The last but not least, after scanning finished, click "Recover" and choose the path where you want to store the lost data.
All of these just cost you a few minutes, after that you will be able to get back deleted files successfully.
Tips
Do not store the recovered data in the path where you lost them before or you will not be able to get them back again.
