The implementation of UHS-II has required a new pinout. Of course, in those cases they can only run as fast as the host device will allow. An important point to note is that micro SD cards designed for these higher speeds will operate with hosts not designed to take full advantage of them.

There is also UHS-I, which tops out at 104 MB/s. The newest and fastest designation is the UHS-II interface standard for SDHC and SDXC devices, with an upper limit of a blistering 312 MB per second. There are a daunting array of explosively evolving standards and capabilities now in force and soon coming online. The speed at which the combination of a micro SD card and its host device can operate is especially critical when performing video recording, as an actual live-stream of data must be recorded as it is happening in real-time. Specifically, devices built for SDXC ™ cards will support all three micro SD cards, and devices built for SDHC ™ will support SD cards.

While the micro SD cards aren’t backwards-compatible, the devices they support are. SD cards will work on devices built to accept the two larger sizes, but SDHC ™ cards won’t work on SD devices, and SDXC ™ cards aren’t backwards-compatible either. Table 1: Micro SD card standards as set forth by the SD Association last updated September 2015. These standards released by the SDA are evolving, so it is important for both manufacturers and users to make sure that decisions are made based on the most up-to-date information. This group sets the standards that are followed by most of the producers of micro SD cards, as well as other types of devices. The SD Association (SDA) is a non-profit group composed of many of the leading manufacturers of micro SD cards. They come with a variety of memory capacities, operate at different I/O speeds, and are governed by internal standards that require care in matching a device to a compatible memory unit.

And that’s about the only thing set in stone in this product class. The geometry of the device is such that, unless the user uses undue force, it is impossible to incorrectly insert the unit into its socket. The physical size of a micro SD card is 11 mm by 15 mm and they are only 1 mm in height. Users can plug the tiny micro SD cards into recessed sockets that are usually placed unobtrusively alongside USB ports or power jacks.

Micro SD cards are built of flash memory, which means that even when the devices they support are turned off, the stored information is retained.

Sd cards information