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XM (requires an eXternal electro-mechanical adapter) – Technically the same as EM, but such adapter usually consists of 2 parts: a pseudo-card with pin routing and physical enclosure size that perfectly match the target slot and a break-out box (a card reader) that holds a real card. Such adapter is the least comfortable to use.
Unlocked and locked SD cards Sony 64 GB SF-M Tough Series UHS-II SDXC Memory Card is one of the few cards in the market without a sliding tab on the write protect notch. Most full-size SD cards have a "mechanical write protect switch" allowing the user to advise the host computer that the user wants the device to be treated as read-only.
Several competing and incompatible memory card formats were developed by several vendors, [8] such as for example the Bee Card, Astron SoftCards, [9] Sega Cards, NEC UltraLite memory cards, [10] [11] and the Mitsubishi Melcard which came in variants using 60 and 50 connector pins.
In 2004, the Reduced-Size MultiMediaCard (RS-MMC) was introduced as a smaller form factor of the MMC, with about half the size: 24 mm × 18 mm × 1.4 mm. The RS-MMC uses a simple mechanical adapter to elongate the card so it can be used in any MMC (or SD) slot. RS-MMCs are currently available in sizes up to and including 2 GB.
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.
The original xD cards (Type S) were available in 16 MB to 512 MB capacities. The Type M card, released in February 2005, [13] uses multi-level cell (MLC) architecture to achieve a theoretical storage capacity of up to 8 GB. As of June 2010, Type M cards are available in sizes from 256 MB to 2 GB. However, the Type M suffers from slower read ...