SD Card Advantages
With the latest storage technology built inside, SD cards are one of the most effective ways to carry extra data and storage with you. The small factor and light weight make this a very easy to store device, as it is very small. By adding an SD card to your smartphone, you increase the storage option dramatically, and you can use it for backing up important data and photos before resetting your phone.
Being small in size, these storage devices consume little power and are a perfect addition to any mobile device.
SD Card Disadvantages
The small form of these cards is both their blessing and their curse, as they are very fragile. The cards are around 1mm thick, and given the small size, they can easily break by accident. It's recommended to store these memory cards in a carrying case or a protective layer if you are not using it on your phone.
SD Cards also have limitations on data writing and reading, but their lifecycle is quite long, around 100,000 cycles. This is not a problem for the normal user, but a power user that uses SD cards for work might consider this a big drawback.
How To Format An SD Card