In the morning I was trying to purchase a microSD card for my new HTC Desire 816 and I came across various classes of microSD cards. I wasn’t aware of what these classes mean, so I did a little research.
It is not something very important although to you it might seem important if the speed of data transfer matters. Basically there are 5 classes of microSD cards, viz, Class 2, Class 4, Class 6, Class 8 and Class 10 – I wonder why all the classes have even numbers. This is a speed rating and nothing else. 2 means the data can be transferred between the card and the devise with which it is being used (the phone, the laptop or the computer) with a speed of 2 MB per second. Similarly, Class 4 means 4MBps, and so on.
Micro SD card is about a quarter the size of a standard SD card. MicroSD card is the smallest memory card available with a size of 15mm x 11mm x 0.7 mm. Micro SD is the format used for the removable flash memory cards. There are adapters in devices meant to use standard SD or Mini SD cards to insert the MicroSD card. Older TransFlash cards are available in 16MB and 32MB format. MicroSD cards are currently available in capacities from 64 MB to 2 GB, while MicroSDHC cards are currently available in capacities from 4 GB to 64 GB.
MicroSD memory cards can help make a cramped phone or tablet feel roomy. They're an affordable way to expand space, often costing less than the price of jumping up to the next level of internal memory. Many Android and Windows phones and tablets, especially models by Samsung and LG, have microSD slots, and many people swear by them.
SD (top), miniSD, microSD cards
|Media type||Memory card|
|Capacity||SDSC (SD): 1 MB to 2 GB,
some 4 GB were made
SDHC: >2 GB to 32 GB
SDXC: >32 GB to 2 TB
|Developed by||SD Association|
|Dimensions||Standard: 32.0×24.0×2.1 mm (1.260×0.945×0.083 in)
Mini: 21.5×20.0×1.4 mm (0.846×0.787×0.055 in)
Micro: 15.0×11.0×1.0 mm (0.591×0.433×0.039 in)
|Weight||Standard: ~2 g
Mini: ~0.8 g
Micro: ~0.25 g
|Usage||Portable devices, including digital cameras and handheld computers|
|Extended from||MultiMediaCard (MMC)|