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2. SD card - Wikipedia

   en.wikipedia.org/wiki/SD_card

   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.

3. Comparison of memory cards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_memory_cards

   PS Vita Memory Card 2012 64 GB Subcompact (15 mm × 12.5 mm × 1.6 mm [7]), compulsory DRM, up to 64 GB, proprietary (can be used on PS Vita only) P2 (storage media) Panasonic MicroP2: 2012 64 GB MicroP2 is a SDXC/SDHC card conforming to UHS-II (Ultra High Speed bus), and can be read by common SDHC/SDXC card readers. xD: Olympus, Fujifilm, Sony

4. Solid-state storage - Wikipedia

   en.wikipedia.org/wiki/Solid-state_storage

   An illustration of the write amplification phenomenon in flash-based storage devices. Over time, advancements in central processing unit (CPU) speed has driven innovation in secondary storage technology. [7] One such innovation, flash memory, is a non-volatile storage medium that can be electrically erased and reprogrammed.

5. External storage - Wikipedia

   en.wikipedia.org/wiki/External_storage

   It can store data in various form as text, graphics, digital images etc. transfer of data is possible between devices having memory stick slots. Memory sticks are available in various storage sizes ranging from 4 GB to 64 GB. The dimensions of a memory stick are 50 mm long, 21.5 mm wide and 2.8 mm thick (in case of pro format).

6. Computer data storage - Wikipedia

   en.wikipedia.org/wiki/Computer_data_storage

   Primary storage in a form of magnetic memory, or core memory, core rope memory, thin-film memory and/or twistor memory; Tertiary (e.g. NCR CRAM ) or off line storage in the form of magnetic cards; Magnetic tape was then often used for secondary storage.

7. CompactFlash - Wikipedia

   en.wikipedia.org/wiki/CompactFlash

   Original PC Card memory cards used an internal battery to maintain data when power was removed. 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."