Over the course of the years, Compact Disks (CDs) have grown out of popularity and we at Ban Landa had previously used them to copy photos (after appropriate editing of course) and hand them to the customer, if that was part of their package and there was once a manufacturer who produced a camera that would record each photo on a mini CD, but that went away as fast as the 8-track stereo.
But due to advancements in technology, what used to be stored on CDs is now stored on SD (Secure Digital) cards, with more than enough room to spare.
SD cards uses flash memory, which is a mechanism by which data is stored via a non-volatile medium. This means that the data can be electrically erased and rewritten continuously.
SD cards come in a variety of sizes: 4, 8, 16, 32, 64, 128 and 256 Gigabytes (GB). Of course, the higher the storage capacity, the more expensive the card. Currently, a 64GB SD card would run about $59.00 in a typical electronics retail store.
Besides their varying capacity, SD cards are also are broken down by speed; that is, the speed at which the data is written to the card. For fast action photography; such as, a football game, a photographer may take 15 photos within a matter of seconds.
To take this type of high-speed photography, the photographer would need an SD card that can absorb a rapid burst of images from the camera within a very short time period. High speed cards are also important when taking videos.
If for any reason, a person is using high speed photography with a DSLR or video camera that has an SD card which is designed for low speed photography, the camera will ‘buffer’ the picture, meaning that there will be a pause before the images can be written to the card. And if the buffering reaches its max, then there will be gaps within the photo bursts and some photos will be lost.
SD card ratings start at Class 2, which is the slowest SD card speed (and less expensive). Class 2 has a write speed of about 2 Mb/s. Class 4 and Class 6 have write speeds of about 4 Mb/s and 6 Mb/s. Class 10 SD cards have write speeds of 10 Mb/s.
So if you are going to take high speed photography or HD video, we recommend you use a class 10 SD card.
For general photography and standard video, a Class 6 would be compatible and for general photography and no video is being used, you can use a Class 2 card.
We hope this helps you get a better idea what SD cards are and how they are used.