Canon camcorders and cameras use built-in memory units to store information. However, users looking to expand internal memory units can do so using one of three compatible memory cards -- SD, SDHC and Compact Flash. Users looking for compatible memory cards should consult their camera or camcorder's user manual for specific requirements, as each will differ.
Compact Flash
Canon cameras, such as the EOS (SLR) family class, use Compact Flash type I and II memory cards for storage. While both memory card types store and transfer data the same way, Compact Flash II cards are smaller in size than type I cards. Compact Flash cards use "Flash" technology that does not require voltage from the battery to store information. Most Compact Flash cards are capable of transferring data at 133MB/sec with capacities of up to 137GB; however, most Canon products have a set capacity of 4GB of expandable memory.
SD Cards
SD cards use "Marks" to indicate the card's capabilities of copying and recording pictures and videos. Canon cameras and camcorders will require SD cards to have "Marks" of a 1, 2, 4, 6 or 10; however, most HD capable camcorders and cameras will require an SD card with Marks 4, 6 or 10 as these Marks indicate the SD card's capability of recording and storing information in High Definition. SD cards with Marks 2, 4 and 6 have a normal-speed interface while 10 has a high-speed interface ideal for both camcorders and cameras.
SDHC Cards
SDHC cards provide more removable storage power, and according to the SD Association, the product "raises the memory performance bar by guaranteeing minimum performance rates." SDHC cards are slightly larger than SD cards, but like SD cards, SDHC cards are compatible with almost all Canon cameras and camcorders. In addition, SDHC cards carry similar Marks --1, 2, 4, 6 and 10 -- that determine their speed and functionality, with Mark 4, 6 and 10 used for HD recording and storing.
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