What is the difference between SD and SDHC and SDXC cards?

What is the difference between SD memory card and SDHC memory card?

sdhc and SD is actually the difference between SD 1.0/1.1 specification and SD 2.0 specification. Although the compilation hand has a copy of the SD 1.1 specification file, but because the SD 2.0 specification only SDA members can get, and for the general user long specification file really does not have much research value, so the compilation of a simple introduction to the SD 1.1 and SD 2.0 specifications embodied in the difference between SD card. Since the SD card specified in the SD 1.1 specification uses the FAT12 and FAT16 file systems, the SD card that complies with the SD 1.1 specification can only reach a maximum capacity of 2G (FAT12 has a maximum disk management capacity of 8M; The final version of the FAT16 partition format has a maximum Disk Management capability of 2G). And with flash flash memory price gradually lower, large capacity SD card quickly became mainstream, so that SD 1.1 under the standard SD card has become more and more unable to meet the needs of the future application, the SD Association designated the SD 2.0 specification, the SD card conforming to the specification becomes SDHC (high Capacity SD Memory Card). As can be seen from the above, due to file system limitations, the capacity limit of the normal SD card is 2G, so 2G becomes the SDHC card capacity starting point. SDHC card with the physical size of the SD card, the biggest difference is that the SDHC card is the FAT32 file system, so the maximum can support to 32GB capacity. 

What is the difference between SD and SDHC and SDXC cards? 　　What is the difference between SD and SDHC and SDXC cards ? SD card, SDHC card, SDXC card difference is the specification is not the same, the SD card maximum support 2GB capacity, SDHC maximum support 32GB capacity, SDXC Maximum support 2TB (2048GB) capacity, support SDXC Card digital device is compatible with support SD card and SDHC card, If the device only supports SDHC cards, then this device will not be able to use SDXC card, but compatible with SD card. The SDXC,SDHC card is not compatible if the device supports only the SD card. For these three kinds of cards, the small series explained in detail, what are their functions and characteristics? SD Card SD is an earlier version and is said to have evolved from MMC. Supports up to 2GB size capacity. SD memory Card is 1999 by Panasonic, Toshiba, SanDisk 3 companies jointly developed small storage media, in the introduction of SD memory card, at the same time set up a safe Storage Digital Card Association (Secure Digital Cards Association; SDA) to develop relevant specifications and to be responsible for the promotion of SD memory card. After years of development, SD card has been the world's highest penetration of electronic products memory card format, for mobile phones, digital cameras (DSC), MP3 music players, personal computers and other electronic products. SDHC Card SDHC is a large-capacity SD card, which is the SD high capacity, which supports a maximum size of 32GB. Sdhc,secure Digital High capacity, large capacity SD, that is, more than 2G SD is called SDHC, because the early SD uses the FAT16 file system, does not support the large capacity, and SDHC upgrade to FAT32, only support more than 2G of large capacity. SDXC Card SDXC (SD eXtended capacity) is the new standard released last 09, supporting a maximum size capacity of 2TB. SDXC is the abbreviation of SD eXtended capacity, is the new standard, in addition to the capacity can be upgraded to a maximum of 2T, mainly can support 300m/s transmission speed, that is, "high-speed SD" card. However, the number of digital cameras supporting SDXC card is not many, mainly the new products introduced this year, and SDXC is not backward compatible, does not support the normal SD and SDHC card slots and card reader. For most digital cameras and DSLR, the high-speed SDHC memory card is fast enough for high-speed continuous shooting and HD video shooting. 　　PostScript: What is the difference between SD and SDHC and SDXC cards ? SD card, SDHC card, SDXC card difference is different, SD card support 2GB capacity, SDHC maximum support 32GB capacity, SDXC maximum support 2TB (2048GB) capacity, and now these card class development faster and more capacity. However, the use of the process should pay attention to backup data, so as not to prevent memory card problems. Related reading: What is CF card? Http://product.pconline.com.cn/itbk/digital/ydcc/1111/2578480.html What is xd card? Http://product.pconline.com.cn/itbk/digital/ydcc/1110/2566515.html What is an expansion card Http://product.pconline.com.cn/itbk/digital/ydcc/1107/2484424.html

the difference between SDHC Class 4,6,10

The difference is that the speed of reading and writing is different. This speed is the minimum standard specified by the standard, which is the minimum write speed per second (the reading speed is generally higher than the write speed). In fact, commercially available cards, even CLASS4 cards, are higher than the minimum standard speed. The class level is converted to the speed per second written by 8KB files: [Class2 (>2MB/S) Class4 (>4mb/s) Class6 (>6mb/s) Class10 (>10mb/s)

What is the difference between SD and SDHC and SDXC cards?