How to fix an SD card issue

SD flash memory cards are convenient for portable data storage and moving data from one computer to another. They are also commonly used in digital cameras to store pictures and to make them easily transportable to computers and printers. Occasionally, you may find that you cannot access the data on a card. This can range from mildly annoying to catastrophic.
Note that there is no guarantee that you can retrieve your data from your card. If the card is physically or electronically damaged, it may not be repairable. But here are some things to try if you can’t access your data from an SD card.