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The rated life of the battery was the only reliability issue. CompactFlash cards that use flash memory, like other flash-memory devices, are rated for a limited number of erase/write cycles for any "block." While NOR flash has higher endurance, ranging from 10,000 to 1,000,000, they have not been adapted for memory card usage.
Memory Stick: Sony, SanDisk: Standard 1998 128 MB Slim and narrow (50 mm × 21.5 mm × 2.8 mm), optional DRM, up to 128 MB PRO 2003 4 GB (not to scale) Slim and narrow (50 mm × 21.5 mm × 2.8 mm), swifter, optional DRM, up to 4 GB Duo 2003 128 MB Compact (31 mm × 20 mm × 1.6 mm), optional DRM, up to 128 MB PRO Duo 2002–2006
The card is composed of two detachable parts, much like a microSD card with an SD adapter. The small memory card fits directly in a USB port and has MMC-compatible electrical contacts. With an included electromechanical adapter, it can also fit in traditional MMC and SD card readers.
A flash drive (also thumb drive, memory stick, and pen drive/pendrive) [1] [note 1] is a data storage device that includes flash memory with an integrated USB interface. A typical USB drive is removable, rewritable, and smaller than an optical disc , and usually weighs less than 30 g (1 oz).
A subsidiary of Western Digital, it is known for its flash memory products, including memory cards and readers, USB flash drives, solid-state drives, and digital audio players. As of March 2019, [update] Western Digital was the fourth-largest manufacturer of flash memory having declined from third-largest in 2014.
The players were available in capacities of 2 GB (e250), 4 GB (e260), 6 GB (e270), and 8 GB (e280). There is also a microSD slot for up to 2 GB of memory expansion. (Larger capacity microSDHC cards up to 32 GB are not supported by the original version 1 firmware, but can be used with alternative Rockbox firmware or on version 2 models.)