How it works
When Sd card was made?
The Secure Digital standard was introduced in August 1999 as an evolutionary improvement over MultiMediaCards(MMC). The Secure Digital standard is maintained by the SD Association (SDA). SD technologies have been implemented in more than 400 brands across dozens of product categories and more than 8,000 models.
What it does?
An SD Card (Secure Digital Card) is an ultra small flash memory card designed to provide high-capacity memory in a small size. In use since 1999, SD Memory Cards are now available in capacities between 16 Megabytes and 1 Gigabyte. An SD card typically measures 32 x 24 x 2.1 mm and weighs approximately 2grams.