==========
 SD cards
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.. contents::
   :local:

Standards
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Acronym Capacity    FS     Spec    Compatibility   Name
======= =========== ====== ======= =============== ==================
SD      128MB-2GB   FAT16          SD, SDHC, SDXC
SDHC    4-32 GB     FAT32  SDA 2.0 SDHC, SDXC      High Capacity
SDXC    64GB-2TB    exFAT  SDA 3.0 SDXC            Extended Capacity
======= =========== ====== ======= =============== ==================

Ultra High Speed, Phase I (UHS-I):
* 50MB/s (UHS-50)
* 104MB/s (UHS-104)

Ultra High Speed Phase II (UHS-II):
* 156MB/s
* 312MB/s

Speed
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SD Speed Class:

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Class  Min Speed
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2      2MB/s
4      4MB/s
6      6MB/s
8      8MB/s
10     10MB/s
====== =========

UHS Speed Class:

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Class  Min Speed
====== =========
1      10MB/s
3      30MB/s
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https://support-in.wd.com/app/answers/detailweb/a_id/36273/~/specifications-and-compatibility-for-sd%2Fsdhc%2Fsdxc-memory-cards
  Specifications and Compatibility for SD/SDHC/SDXC Memory Cards.