Although fake micro SD cards are less common than in the past, they still exist. Some are much slower and do not offer the capacity they claim. The SD Association was established to promote these memory devices and is composed of over a thousand member companies. In the first few years of its existence, three manufacturers announced the formation of the association, and since then, the association has grown to over 1,000 members. In January 2010, the average price of a 16 GB class 2 micro SD card was $40.
What You Need to Know – Micro SD Cards
Besides the physical sizes, SD cards can also be categorized into various transfer modes. Application Class A1 and A2 are the most popular formats. They both have a minimum sustained write speed of 1000MBps and a minimum random read speed of 500MBps. If you’re looking to use your SD card to install Android apps, consider purchasing one that features a high-speed SD card with an A-rating.
The SD Association defines a speed rating for cards. A micro SD card can be rated as Class 2 (2MB/s) or Class 10 (10MB/s) depending on its size and capacity. Generally, it’s not necessary to buy a card that has the highest speed possible. A standard SD card will have a minimum read speed of 100MB/s and a maximum of 2GB. There are no special requirements for these cards, but they are inexpensive.