Short for Secure Digital Card, the SD Card is one of the more common types of memory cards used with electronics. The SD technology is used by over 400 brands of electronic equipment and over 8000 different models, including digital cameras can cell phones. It is considered the industry standard due to the wide use. The SD card has a recognized maximum storage capacity of 2 GB (gigabytes), but 4 GB versions do exist. The 4 GB versions were not widely used due to issues & limitations with the technology at that capacity.
The three versions of the SD card, along with their physical dimensions, are shown below.
- SD - 32mm x 24mm x 2.1mm.
- miniSD - 21.5mm x 20mm x 1.4mm.
- microSD - 15mm x 11mm x 1.0mm.