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Packages the flash memory, currently soldered in shipping smartphones, into a removable card form factor. Uses the SCSI command set including queuing. The electrical interface makes use of differential signaling , which enables high bus speeds and robustness under noisy conditions and reduced pin count (compared to parallel bus alternatives ...
Manufacturers may report best-case speeds and may report the card's fastest read speed, which is typically faster than the write speed. Some vendors, including Transcend and Kingston, report their cards' write speed. [118] When a card lists both a speed class and an "×" rating, the latter may be assumed a read speed only. [citation needed]
The 120GB SanDisk Extreme Pro CFast 2.0 memory card is the world's fastest memory card, with read speeds of up to 450MB/s (3000X) for maximum workflow efficiency and write speeds up to 350MB/s ...
For CDs, the 1× writing speed is equivalent to the 1× reading speed, which in turn represents the speed at which a piece of media can be read in its entirety, 74 minutes. Those 74 minutes come from the maximum playtime that the Red Book (audio CD standard) specifies for a digital audio CD (CD-DA); although now, most recordable CDs can hold 80 ...
Best of all, UHS-II cards will be fully backwards compatible with older devices and readers, as the speed increase simply relies on a new row of pins on a familiar form factor.
CompactFlash IDE (ATA) emulation speed is usually specified in "x" ratings, e.g. 8x, 20x, 133x. This is the same system used for CD-ROMs and indicates the maximum transfer rate in the form of a multiplier based on the original audio CD data transfer rate, which is 150 kB/s.
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