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Posted on October 31, 2008 by Shawn Paul | Posted under Hardware
Fast transfer speed of the SD Secure Digital memory card
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From 1990-2000, many new formats of the memory cards were introduced like the memory stick, MMC (Multi-Media Card), SD (secure digital) card, and similar types of other memory cards. The compact cards were big in size. Therefore, there was need of smaller size memory cards for PDAs, cell phones and digital cameras. In 2001, the CF (Compact Flash) and SM (Smart Media) cards were very popular for use in digital cameras. By the year 2005, the MMC and SD cards became more successful and they took over SM (Smart Media) cards. Nowadays, the modern personal computer systems have buit-in slots for the use of memory cards. The SD (Secure Digital) memory cards are lighter and smaller in size than the compact flash (CF) cards. The SD cards have interface of nine pin and data transfer bus of 4-bit. Initially the CF cards were cheaper than the SD cards, but that is not true nowadays. SD Secure digital are all solid state memory cards. There is also advanced form of the SD card called the SD High Capacity SDHC. The capacity of the SDHC cards reaches up to 32GB. The SD cards were developed to avoid the illegal copying of music and for the “digital right scheme". Secure Digital cards have the encryption hardware. The SD cards and the MMC are very much similar but the MMC does not have the “encryption hardware" along with some technical differences. San disk introduced series of “extreme-IV" in the mid of 2006. These SD cards offer transfer speed of 40MB/second, double from the San disk “extreme-III" SD cards. The San disk extreme-IV has the similar architecture design and wide range like that of San disk “extreme-III" series. Laxer launched the “ultra direct memory access UDMA" cards in February 2007. These cards had the data capacities of 2 GB to 8 GB. The UDMA cards from Laxer have improved performance of about 125% as compared to the previous version Laxer 133x CF product line. The native writing speed of the extreme-III series is 20 MB/second. The speed of extreme cards and the San disk ultra-II memory cards is the same. When the data is transferred to personal computer through optimized “card reader", that is where the cards become the fastest. For instance, extreme-IV cards from San disk when connected to fast PC can deliver up to 40MB/second of transfer speed through the San disk card reader Fire wire 800. But when it is used with card reader of generic USB 2.0, then the transfer speed lowers down to 7MB/second. Therefore, if the user wants to get the ultimate speed and performance of the secure digital SD card, then he has to careful with the card reader he is using. The fast speed memory card will not be cost effective when the transfer speed from memory card to the personal computer is not important to the user. The user can download the fast speed 2 GB memory card to fast personal computer system with in less than a minute by using the “Firewire-800" memory card reader. On the other hand, slower USB 2.0 and memory card can take up to six minutes. For more details and online order, please visit www.tape4backup.com About The Author: Shawn Paul (Marketing Manager) Tape4backup.com 34972 Newark Blvd, # 501, Newark CA 94560 Tel : 888-491-4949 Fax : 888-449-5050 Email: sales@tape4backup.com |
Tags: SD MEMORY CARD, SECURE DIGITAL, MINI SD, MINISD, MMC, MICROSD, MICRO SD, LEXAR, SANDISK
