The secure digital SD memory cards are divided into four families namely, the Secure Digital Standard Capacity, the Secure Digital High Capacity, the Secure Digital Extended Capacity and the Secure Digital Input Output. Their normal storage capacities are 16giga bytes (16 gb sd cards), 8giga bytes, 4giga bytes respectively. The secure digital input output card is a combination of an input and an output device and is gaining popularity among manufacturers of portable electronic devices due to its flexibility and compatibility with other host controllers. If you encounter the problem of the card being too small all you have to do is use a secure digital adaptor which will enable the small card to fit into the large port and allow communication with the device.
The communication protocols of the different families are different and may sometimes present a problem where the device does not recognise the SD card attached to its peripheral port. This can be remedied by getting regular firmware updates that will allow compatibility with the device. They are however compatible with all operating systems and can be used on any computer.
With the advancement of technology and its access by different groups in society, the SD cards have become popular and essential in the convenient transfer and storage of information. It is probably more used by teenagers and young adults who are inseparable with their high-tech devices like i-pods, i-phones, smart phones, palmtops and laptops. This group of youngsters live for their music and movies and the easiest way to move it from one source to the other is through the use of secure digital cards and flash disks. The other common users are those transferring data from the internet to personal computers and require something small and portable. College and university students also carry a lot of information on these cards like assignments and tutorials. Recent makes allow for one to carry larger amounts of data while still remaining small in size.