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FreeCAD-library/Computing/Storage/SD
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Jeff Hayes bbd7bfd614 setting up to add more versions of SD cards
2024-07-28 16:43:45 +02:00
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cards.png Move SD cards to Computing. 2023-10-12 16:54:10 -06:00
Generic_MICRO_SD_CARD.fcstd Move SD cards to Computing. 2023-10-12 16:54:10 -06:00
Generic_MICRO_SD_card.step Move SD cards to Computing. 2023-10-12 16:54:10 -06:00
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Generic_SD_card.step Move SD cards to Computing. 2023-10-12 16:54:10 -06:00
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README.md setting up to add more versions of SD cards 2024-07-28 16:43:45 +02:00
README.txt setting up to add more versions of SD cards 2024-07-28 16:43:45 +02:00
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SD_card.FCStd File and folder organization 2020-04-03 15:16:07 -06:00
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README.md

All Secure Digital (SD) storage devices contain one or two NAND flash memory chips and a processing unit to manage the operation of the card.

There are three sizes of SD Card permitted by the spcification:

  1. original : 1.26 x 0.94 x 0.083 to 0.055 inches
  2. miniSD : 0.85 x 0.79 x 0.055 inches
  3. microSD : 0.56 x 0.43 x 0.039 inches

or, in metric:

  1. original : 32 x 24 x 2.1-1.4 mm
  2. miniSD : 21.5 x 20 x 1.4 mm
  3. microSD : 15 x 11 x 1 mm

Standard SD cards must have with a toggle switch that that permits or blocks write operations on the card. The mini and micro sized cards don't offer this feature.

SD cards are available in five storage capacities:

  1. Standard (SDSC): up to 2 GB
  2. High (SDHC): from 2 to 32 GB
  3. Extended (SDXC): from 32 GB to 2 TB
  4. Ultra (SDUC): from 2 TB to 128 TB
  5. Input Output (SDIO): storage with a Bluetooth transciever and/or a GPS receiver

Storage Formats

  • SDSC FAT12, FAT16, and FAT16B.
  • SDHC FAT32
  • XC/HC exFAT

The exFAT file format was specifically designed for NAND flash devices and is likely to remain the standard for many more years.