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SD v3.0 brought Extended Capacity (SDXC) [15] specifications offering memory cards with up to 2 TB of storage and Ultra High Speed – bus transfer speeds of up to 104 megabytes per second in 2009. [16] SD versions 4.0, v4.10 and v4.2 were introduced between 2011 and 2013.
U3 was a joint venture between SanDisk and M-Systems, [1] producing a proprietary method of launching Windows software from special USB flash drives. Flash drives adhering to the U3 specification are termed " U3 smart drives ".
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]
The SanDisk iXpand product family, including the iXpand Flash Drive and iXpand Base, is made specifically for use with the Apple iPhone and iPad. [84] [85] [86] The 400 GB SanDisk Ultra microSDXC UHS-I card was designed primarily for use in Android smartphones that include an expansion slot. [87] [88]
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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).
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A test by CDRLabs of a stand-alone 32 GB SanDisk ReadyCache product, which was added to a quad-core desktop (Core i5-2400 CPU) equipped with a 7200 rpm hard drive, found a reduction in boot time from 25 down to 14 seconds, but found no significant improvements in random read/write tests. [15]