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Same build as SD/SDHC/SDXC, but greater capacity and transfer speed. Standard goes up to 128 TB (not compatible with older host devices). SmartMedia: Toshiba: 3.3/5 V 1995 128 MB Very slim (45.0 mm × 37.0 mm × 0.76 mm), no wear leveling controller, up to 128 MB. This particular example shows the write protect sticker (the silver disc).
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.
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. [114] When a card lists both a speed class and an "×" rating, the latter may be assumed a read speed only. [citation needed]
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 ...
In February 2017, the SD Association expanded its App Performance Class with Application Performance Class 2 (A2), more than doubling random read and write speeds guaranteed in the entry-level App Performance Class 1. . [22] In February 2017, the SD Association introduced UHS-III, doubling the fastest SD memory card transfer rate up to 624 MB/s ...
CFexpress is a standard for removable media cards proposed by the CompactFlash Association (CFA). The standard uses the NVM Express protocol over a PCIe 3.0 interface with 1 to 4 lanes where 1 GB/s data can be provided per lane.
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