The initial SD cards compliant with revision 1.1 of the SD spec were limited to 2 GB, which is why SDHC (SD 2.0) was introduced to enable capacities of up to 32 GB. In addition to capacity, the SD 2.0 specification also provides performance classification to guarantee certain minimum throughput. There are four classes in the spec: Class 2, Class 4, Class 6, and Class 10. The number tells you the minimum transfer speeds in MB / s that can be sustained by the memory card.
2011 年 05 月 25 日
Other Formats
We e dealing with full-sized SD flash memory cards in this piece. These measure 32 x 24 x 2.1 mm, and they currently store up to 128 GB of data. There are many vendors and various speed classifications, but they all operate within the SD card memory standards SD 1.1, SD 2.0, or SD 3.0.
You typically find speed ratings like 133x or 300x printed on most of the products or product boxes. These are comparisons to the single-speed data transfer speeds of the good old CD-ROM. A 1x transfer rate is equivalent to 1.2 Mb / s or 150 KB / s.
SD cards are also available in various speeds. If you e using a point-and-shoot digital camera or a standard-definition pocket camcorder, speed class won matter much. If you e shooting high-resolution RAW photos with a digital SLR, however, you need a quick card to take more than two or three shots at a time. SD cards are generally described by their Speed ??Class, ranging from Class 2 (slowest ) to Class 10 (fastest). There also a separate, even faster category called UHS Class 1 (for Ultra High Speed), but most current devices can use them. While the SD Association (the group that defines SD card technology) doesn release exact speed standards for card classes to non-members, it does offer loose guidelines for which classes are acceptable various uses. Class 2 is suitable for standard-definition video recording, while Class 4 and Class 6 can record high-definition video. Class 10 is the card for HD video and “HD still consecutive recording,” which, like the classes speeds, is ill-defined. The various card classes seem to have different speed ranges according to different memory manufacturers. According to Sandisk , for example, Class 4 cards offer read and write speeds of 15 megabytes per second (MBps), Class 6 cards can handle 20MBps, and Class 10 cards reach 30MBps. Kingston, on the other hand, describes its Class 4 cards as delivering a 4MBps data transfer rate, Class 6 as having 15MBps write speed, and Class 10 offering a 40MBps data transfer rate. According to Sandisk, UHS-1 SD cards can transfer up to 45MBps, and according to the SD Association, the maximum transfer speed based on the interface bus used is 310MBps (though this limit won be reached by cards for a long time, likely after several faster UHS speed classes are defined). Generally, if you want to shoot HD video or if you plan on taking a lot of high-resolution photos in quick succession (or use a digital SLR RAW image file format), buy a Class 10 card. If you e planning to just take snapshots or occasionally show videos, Class 4 or Class 6 will do. Since even smartphones can record HD video these days, Class 2 cards aren the best choice. They e simply too slow to record HD video, so you e limiting your device features. The price difference between Class 4, Class 6, and Class 10 cards can vary, but not vastly. At the time of this writing, on Newegg.com, 32GB SDHC cards made by Kingston Technology were available in Class 4 for $ 54, Class 6 for $ 66, and $ 73 for Class 10. UHS- 1 cards are much, much more expensive than the other cards; Kingston was offering a 32 GB UHS-1 SD card for $ 293, and that wason sale. Unless you e a professional who needs absolute certainty in speed when dealing with very large images or high-bitrate video, you don need UHS-1. In fact, unless you have professional or semi-professional equipment, you probably won even be able to use these cards. Always check your device documentation for support information before you commit to a memory card
More on Wiki
SD card specs SD card specifications explain (in English)
The SD 3.0 (also known as SDXC) specification provides a ceiling of up to 2 TB . Although there are only a few SD memory cards with up 64 GB of capacity available, the SDXC standard also includes the modified UHS-I specification (Ultra HighSpeed ??I), supporting up to 104 MB / s. This is the successor to the High -Speed ??Bus I / F (Class 10) and Normal Bus I / F (Class 2, 4, 6), and it is the basis for products that can deliver more serious bandwidth. Be sure that any card reader you choose works with SDXC cards, as you cannot fully exploit SDXC cards with SDHC card readers.
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We find that the Class ratings are more useful than the CD-ROM-based multiplier rating, as equivalent MB / s throughput is guaranteed and usually even exceeded by many SD cards. Speed ??ratings are important if you want to use your memory card on devices that require a certain minimum bandwidth, such as HD camcorders and digital SLR cameras. Once you want to store photos in RAW and JPEG mode, you need a fast memory card to support continuous shooting at several pictures per second. < br /> 
SD Card class2, class4, class6, class8, class10
SD card: 32 x 24 x 2.1 mm MicroSD card: 11 x 15 x 1.0 mm MiniSD card: 20 x 21.5 x 1.4 mm
From: http://www.tomshardware.com/reviews/sdxc-sdhc-uhs- i ,2940-2. html Physical Format
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In addition to conventional SD cards, you l also find miniSD and microSD cards on the market. Those are well-suited to mobile devices like smartphones. They max out at 32 GB and they are electrically compatible with conventional SD cards, meaning that simple adapters allow you to access them. The miniSD form factor measures 20 x 21.5 x 1.4 mm. However, miniSD has never been very popular, and is on its way to disappear soon. The industry is either using SD or microSD.
This one is very simple. SD cards offer different storage capacities, and that amount of space determines the card size classification. Odds are the microSD card in your smartphone isn a microSD card. It a microSDHC card, or Micro Secure Digital High Capacity. “Standard” SD cards max out at 2GB capacity, based on their classification and the controller used by SD-only devices. Most SD cards you l find today are technically SDHC, with capacities between 4GB and 32GB. The largest class is SDXC, or Secure Digital Extended Capacity, can range from 64GB to 2TB. (Currently, no cards actually get anywhere near 2TB ; the largest capacity available is 128GB.) While larger is better, you need to make sure your device can use the larger card. The SD / SDHC / SDXC classification isn just for cards, but for devices as well. Older digital cameras can only read SD cards, making SDHC cards useless. Similarly, cameras that aren SDXC-compatible won accept 64GB cards. Most current devices are SDHC compatible, but double-check your older devices before getting SDHC cards, and check the specs on your newer gear before getting SDXC cards. Speed ??Class
microSD cards only measure 11 x 15 x 1.0 mm and are even smaller than a GSM cell phone SIM card. These are increasingly popular, as most smartphone designs utilize microSD cards as flexible storage. We currently find microSD cards at up to 32 GB, and it only a matter of time until they e also available at higher capacities. However, only few microSD cards deliver performance that is anywhere near the throughput we find on the devices tested in this article.
The first thing to consider when getting a memory card is where you e going to use it. Different cameras, camcorders, and smartphones use different sizes of card, and while you can start with the smallest and use adapters to work your way up, it generally best to use the card size intended for the device. The standard SD card is the largest and has been in use the longest, measuring 32 by 24 by 2.1 mm (HWD), weighing 2 grams, and showing the signature cut-corner profile SD cards are known for. Most digital cameras you can buy today use standard-size SD cards. Even though they e the largest SD card, they re still very small, and are dwarfed by the CompactFlash cards used by professional photographers in high-end digital cameras, like the $ 5,000 Canon 1D Mark IV. However, the cards can get even smaller. MiniSD cards, the least frequently used format these days , measure 21.5 by 20 by 1.4 mm (HWD) and weigh just a gram, making them just over a third the volume and taking up just over half the area of ??a full-size SD card. Instead of cut corners, miniSD cards have a tapered corner to help you orient the card when putting it in a slot. This design aspect follows with the smallest of the SD cards, the microSD card. MicroSD cards, which are used in most cell phones and smartphones, are downright Lilliputian, measuring 15 by 11 by 1 mm (HWD) and weighing only half a gram. With a total volume of 165 mm3, you could fit nine microSD cards inside a single SD card (though realistically, with the slight lip found on the end of microSD cards, you could probably only squeeze in six). Generally, microSD cards cost slightly more than SD cards of the same size and speed class, but that, along with the physical size are the only effective differences. Capacity
Effectively , a 400x SD memory card can theoretically reach 400 * 0.15 MB / s, or 60 MB / s.
Don be blinded by these numbers though, as they typically reflect peak performance capabilities and do not reflect everyday throughput. To make matters worse, most vendors refer to read performance numbers and hide away the fact that the large majority of SD cards deliver much lower write performance.
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to crack the financing bottleneck, Kwun Yam Shan streets together financial institutions, actively pursuing a “syndicated loan UNPROFOR” new model. East Timor dyed, double lotus seven textile companies constitute a combination of loans, received some 19.6 million yuan of the group financial credit, gucci wallet, while 400,000 yuan each deposit guarantee payments as collateral. Because the member is a combination of high and low travel stakeholders, commensurate with the scope, relationships and business financing needs are, so the soon huddled. Eras, “syndicated loan UNPROFOR” business has grown to 20, running outstanding.
“national policy” to accelerate the construction of apparel textile brands online article from Textile City. Reproduced please specify! , 2011 women fashion trends, its scope of business from the previous year growth of 58 to 96, there is a world 2 / 3 increase in the efficiency of enterprises in more than 30%, Goldlion official website, thousands of Dyed Fabric Mill in the international financial crisis is not a under the closure of business.
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key words: traditional elements / re-design, mood / charm, the new Chinese wind
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fabric texture: velvet fine sale of soft texture
News Agency August 24, is facing this generation change the world in general and in-depth, “home” are more than ever hour for us to supply an implementation of fantasy and wonderful living space. While external circumstances can not choose, but we can all hope, creativity, craftsmanship, color full converging to a very positive energy, better adapted to choose a career in the former situation, the pattern-body, still in the doldrums in the elegant living from me, In the “home” is in itself alone to make excellent interpretation.
pattern: the pattern of traditional Chinese fashion, said: auspicious patterns, nearly plain between the paper-cut patterns, amenities ink, meticulous reconstruction of flowers and birds and so broken up.
process characteristics: traditional silk craft, embroidery or jacquard tapestry satin, etc. impose, juicy couture official website, provide embroidered joint,
“2010 China home textile trends” will be held August 25 in Shanghai China International Home Textiles and Accessories Exhibition announced. The trend from the people as usual approach and emotional needs of subsistence left, drawing inspiration parties to “rhyme new, fun in science and technology, free flying, spiritual garden, multi-splendor” as the theme of the trend, reflecting the popularity of home textiles in the future year philosophy and life style very characteristic of the home. To allow the “popular” lead cost, stimulate market demand, to promote the skills and industry inexhaustible art (design) is different, so double coordinated textile industry growth.
use of color: Mark of the Chinese color.
China Home Textile Association is committed to establish the China operation degree spinning popular trend seminars, that night three years to promote and promote the use of the system. Since 2007, China established a textiles degree fashion trend since the discussion and promotion of things rooms, and art schools and programs at home and mutual aid organizations, senior R
700-800 million bales of cotton. Therefore, we are waiting for China cotton imports from India issued the policy.
NAFED has special care of its high officials of Gujarat, Maharashtra, Punjab, Andhra Pradesh and Haryana held on schedule in cotton price trend assessment, gucci wallet, two years after the end of Britain, NAFED the adoption of market intervention and dry.
kg), based on the price would probably be lower, so the, NAFED need for market intervention.
NAFED, a high official said Eve cotton yield in India this year, production is expected in about 3500-3600 million bales (170
after the acquisition, further processing of cotton, ginning, packing, and then follow the Cotton sold the company scale.
Zhengzhou effort to create an article from the online wholesale clothing Textile City. reproduced please specify!. if the price declines, NAFED will be acquired in accordance with the policy.
rupees / quintals, the minimum support price in the long-staple cotton is Rs 2,800 / quintal.
Now, the weak dollar, and therefore reduce export country in Europe, the European country of export of yarn in this case, the European exports are expected to eliminate the Indian authorities and the Cotton Corporation of India (CCI) authorize the acquisition of cotton NAFED agent acting agencies, poly fabric
Indian new year (just beginning) of cotton-expected yield. To keep the price below the home and of the government minimum support price (MSP), India, the world agricultural mutual aid marketing alliance (NAFED) is appropriate, the use of market intervention measures.
at the present price of cotton above the government enacted the MSP price the lowest long-staple cotton in 2011-12 support price is 3,300
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If the minimum support price below the price of resistance, then the government will acquire in accordance with the minimum support price of cotton, to keep prices stable, ugg official website, let the price fall below the minimum purchase price, as promised, farmers would not have suffered the loss and the minimum sustain the farmer is the appropriate price of capital Growing plants to ensure that farmers are not lost, which also encourage more farmers produced nearly plain cotton.
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cotton export demand continued to boost cotton prices online article from Textile City. Reproduced please specify! , It is very stress with dressing. It does not matter what school MM mix and match fashion outfit Japan, gucci purse, black primer outside the ride a loose shirt sweater, interlocking with the highlight of cascading tide.
into the fall, in which cool earth weather, the 2011 women spring fashion
Gucci GUCCI wallet / classic double-G canvas with leather / Wallet
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Scarf, repeatedly received praise, wearing Gucci has represented a symbol of social position and how to shop in Taobao.
Kelly plans Flower
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