SD cards are commonly used in DVRs and self-contained cameras. These are brand new in the retail box. We offer 1Gb, 2Gb, 4Gb, 8Gb, 16Gb, and 32Gb Secure Digital (SD) cards in the full size and the micro size.
All SD cards sold are Class 6 cards. This allows for the fastest data transfer rate possible to provide crystal- clear and smooth video. If you purchase cards somewhere else, you may unknowingly buy slower cards that will not perform as well. Every single card that we sell is Class 6.
Cards that are 4Gb or higher will be SDHC (High Capacity) cards. ALL SD cards (not just from us, but anywhere) that are 4Gb or higher will be SDHC cards.
Secure Digital memory cards are the most popular flash memory card for digital cameras and many surveillance DVRs. Introduced in 1999 by Panasonic, Toshiba, and SanDisk, cards up to 128GB are available with huge capacities planned for the future (see SDXC below).
SD Cards use the same 32x24mm form factor as the earlier MultiMediaCard (MMC), but are slightly thicker (2.1mm vs. 1.4mm). SD Card readers accept both formats.