Flash Memory - SD Cards, Compact Flash, Micro SD - Newegg

Any recent version of the above can format SD cards using the  file system.

SanDisk 32GB Class 4 SDHC Memory Card, Frustration-Free Packaging- SDSDB-032G-AFFP (Label May Change)

$17.99
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  • SD cards will only fit into matching slots. You can’t plug a microSD card into a standard SD card slot — it won’t fit. However, you can purchase an adapter that allows you to plug a smaller SD card into a larger SD card’s form and fit it into the appropriate slot.

    But the differences between SD card capacities don’t stop there. Standard SDSC (SD) cards are 1 MB to 2 GB in size, or perhaps 4 GB in size — although 4 GB is non-standard. The SDHC standard was created later, and allows cards 2 GB to 32 GB in size. SDXC is a more recent standard that allows cards 32 GB to 2 TB in size. You’ll need a device that supports SDHC or SDXC cards to use them.

  • At this point, the vast majority of devices should support SDHC. In fact, the SD cards you have are probably SDHC cards. SDXC is newer and less common.

    What was missing in the FatFsMemSDHC component presented is support for a ‘write protection’ pin. Well, that write protection is not present on micro-SD cards, and on normal SD cards it is a simple plastic thing with no real hardware meaning: it is all up to the software to respect it. While my other SD card components have support for such a write protection detection, it was lacking for the FatFsMemSDHC (for Kinetis) component. Time to fix this!

    SD, SDHC, SDXC
    SD (top), miniSD, microSD cards
    Media type Memory card
    Capacity SDSC (SD): 1 MB to 2 GB,
       some 4 GB were made
    SDHC: >2 GB to 32 GB
    SDXC: >32 GB to 2 TB
    Developed by SD Association
    Dimensions Standard: 32.0×24.0×2.1 mm (1.260×0.945×0.083 in)
    Mini: 21.5×20.0×1.4 mm (0.846×0.787×0.055 in)
    Micro: 15.0×11.0×1.0 mm (0.591×0.433×0.039 in)
    Weight Standard: ~2 g
    Mini: ~0.8 g
    Micro: ~0.25 g
    Usage Portable devices, including digital cameras and handheld computers
    Extended from MultiMediaCard (MMC)

  • SPI Bus Mode
    MMC
    Pin
    SD
    Pin
    miniSD
    Pin
    microSD
    Pin
    Name I/O Logic Description
    1 1 1 2 nCS I PP SPI Card Select [CS] (Negative logic)
    2 2 2 3 DI I PP SPI Serial Data In [MOSI]
    3 3 3 VSS S S Ground
    4 4 4 4 VDD S S Power
    5 5 5 5 CLK I PP SPI Serial Clock [SCLK]
    6 6 6 6 VSS S S Ground
    7 7 7 7 DO O PP SPI Serial Data Out [MISO]
    8 8 8 NC
    nIRQ
    .
    O
    .
    OD
    Unused (memory cards)
    Interrupt (SDIO cards) (Negative logic)
    9 9 1 NC . . Unused
    10 NC . . Reserved
    11 NC . . Reserved

    No. Although SDIO cards are within the width and thickness specifications and should not damage the slot if inserted, they will not be recognized by the computer.

Speed Class SD cards are also available in various speeds

In the definition of SDHC cards in version 2.0, the C_SIZE portion of the CSD is 22bits and it indicates the memory size in multiples of 512KB (the C_SIZE_MULT field is removed and READ_BL_LEN is no longer used to compute capacity). Two bits that were formerly reserved now identify the card family: 0 is SDSC; 1 is SDHC or SDXC; 2 and 3 are reserved. Because of these redefinitions, older host devices do not correctly identify SDHC or SDXC cards nor their correct capacity.