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2. SD card - Wikipedia

   en.wikipedia.org/wiki/SD_card

   Comparison of SD card Speed Class ratings [113] Minimum sequential writing speed ... The micro form factor is the smallest SD card format. [169] microSD, microSDHC ...

3. Comparison of memory cards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_memory_cards

   Same build as SD but greater capacity and transfer speed, 4 GB to 32 GB (not compatible with older host devices). miniSDHC: 2008 32 GB [4] Same build as miniSD but greater capacity and transfer speed, 4 GB to 32 GB. 8 GB is largest in early-2011 (not compatible with older host devices). microSDHC: 2007 32 GB [4]

4. SD Association - Wikipedia

   en.wikipedia.org/wiki/SD_Association

   Multiple SD specifications were announced in 2004 including the First Advanced Security SD (ASSD), First Controller Interface and SD v1.10 with high-speed mode (25 MB/s). MicroSD specifications [ 13 ] were released in 2005 with SD v2.0 SD- High Capacity (SDHC), introducing memory cards with up to 32 GB of storage in 2006. [ 14 ]

5. Memory card - Wikipedia

   en.wikipedia.org/wiki/Memory_card

   In 2000 the SD card was announced. SD was envisioned as a single memory card format for several kinds of electronic devices, that could also function as an expansion slot for adding new capabilities for a device. [21] In 2001, SmartMedia alone captured 50% of the digital camera market and CF had captured the professional digital camera market.

6. Optical storage media writing and reading speed - Wikipedia

   en.wikipedia.org/wiki/Optical_storage_media...

   For Blu-ray discs, 1× speed is defined as 36 megabits per second (Mbit/s), which is equal to 4.5 megabytes per second (MB/s). [7] However, as the minimum required data transfer rate for Blu-ray movie discs is 54 Mbit/s, the minimum speed for a Blu-ray drive intended for commercial movie playback should be 2×. The fastest Blu-ray speed is 16×.

7. CompactFlash - Wikipedia

   en.wikipedia.org/wiki/CompactFlash

   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.