What is a 4G memory card?
Memory card is a portable flash chip that retains data even when the energy source is turned off. Removable, re -recorded memory cards are used in digital camcorders and cameras, mobile phones, personal digital assists (PDA), global positioning devices, game consoles, digital multimedia players, mobile computers and other personal electronics. Approximately the size of the postal stamp with about the same thickness as the credit card is available in many capacities that correspond to different specifications and standards. The 4G memory card indicates the data capacity of four gigabytes (GB).
The most common type of Flash memory card is Secure Digital (SD), which includes high capacity cards (SDHC) and SD extreme capacity (SDXC). The Secure Digital Association (SDA) is responsible for determining the specifications and standards for these cards. The SD also includes ultra-non-limited minisd and microSD formats.
Multimediacard (mmC) It is slightly another type of memory carteten than the SD card. It can be used in any SD reader that has MMC drivers. The MMC open standard includes a range of alternative smaller formats. Although SD cards have become dominant, MMC is still in extensive use and 4G memory card could refer to MMC card.
Olympus and Fujifilm created a XD-Picture card; Another type of memory card used in some digital cameras since 2002. Footprint this card differs from SD card, so products made for using XD card cannot replace other cards. In this taste, a 4G memory card is also available, although since 2010 Olympus and Fujifilm have been gradually issued XD in favor of production products that support SD cards.
SD version 1.X (or "standard" SD) originally supported capacity up to 512 MB. The revision allowed capacity up to 4 GB. Older products may not be in line with RevidBy releasing version 1.X, in which case will read the 4G memory card as with less capacity. Firmware updates may be available for these older products.
The following version of SD 2.0 (SDHC) will rise where version 1.X ended, at a threshold of 4 GB. SDHC cards boast capacities from 4 GB to 32 GB, but SDHC has introduced another significant improvement compared to standard SD cards: SDHC cards are faster.
Unlike standard SD cards, SDHC specifications require guaranteed minimum permanent speeds. SDHC cards are designed as Class 2, Class, 4 or Class 6 cards, etc., each with a correlation minimum data transfer rate (DTR). The minimum DTR for class 2 is two megabytes per second (MB/PS); Class 4 is four MB/PS; and class 6 is six MB/PS. The maximum DTR is much higher.
This differs from standard (version 1.x) SD cards that do not have minimal DTR. Standard SD cards start from zero speed, buildings to maximum write speed and after the process is fromI am complete, receding towards the zles. This results in an average DTR that is much lower than the maximum rate evaluated. In short, the standard SD 4G memory card will be much slower than its SDHC equivalent.
products that support memory cards are evaluated for their ability to write data in the storage. The product rated at maximum write speed 13x is equal to the SDHC Card Card Card SDHC (MRS). The 26x product equals MRS class 4, while Mrs class 6 is equal to 40x rating. A faster card does not cause the device to run faster.
Before purchasing a 4G memory card, make sure it is supported by the device. Readers of SDHC (ports/slots) are backward compatible, able to read standard SD cards; However, products that support only standard SDs will not be able to read SDHC cards. In some cases, firmware upgrades may be available from manufacturers.