SD card - Wikipedia
https://en.wikipedia.org/wiki/SD_card
Secure Digital, officially abbreviated as SD, is a proprietary non-volatile memory card format developed by the SD Association (SDA) for use in portable devices. The standard was introduced in August 1999 by joint efforts between SanDisk, Panasonic (Matsushita) and Toshiba as an improvement over MultiMediaCards (MMCs), and has become the industry standard. The three companies forme… Block size: Variable Capacity: SD: Up to 2 GB, SDHC: over 2 GB to 32 GB, SDXC: over 32 GB to 2 TB, SDUC: over 2 TB to 128 TB
Block size: Variable
Capacity: SD: Up to 2 GB, SDHC: over 2 GB to 32 GB, SDXC: over 32 GB to 2 TB, SDUC: over 2 TB to 128 TB
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