The iMac running Yosemite 10.10.5 cannot read the 4GB SD card (Sony SD HC). Why is this happening? Even after restarting the iMac and reinserting the SD card, it still doesn’t work.
This may be a problem with your SD card reader or port, you can try using a different SD card reader, or if you are using an external card reader, try a different port or device to test.
Due to frequent use, your SD card may be corrupted or encounter issues. You can insert the SD card into another Mac to see if it can be read. If it cannot be read, it may need to be formatted. In this case, if you need to access the files on the SD card, you should use data recovery software.
You can use iBoysoft Data Recovery for Mac, which is easy to use and has a high success rate. I used it to recover data from a corrupted SD card.
Download iBoysoft Data Recovery for Mac and let it help you retrieve the data from your SD card.