would broadcast commands to all cards and identify the card to respond to the command using its unique serial number. In practice, cards are rarely ganged together because open-collector operation has problems at high speeds and increases power consumption. Newer versions of the SD specification recommend separate lines to each card. Compatibility Host devices that comply with newer versions of the specification provide backward compatibility and accept older SD cards. For example, SDXC host devices accept all previous families of SD memory cards, and SDHC host devices also accept standard SD cards. Older host devices generally do not support newer card formats, and even when they might support the bus interface used by the card, there are several factors that arise: A newer card may offer greater capacity than the host device can handle (over 4 GB for SDHC, over 32 GB for SDXC). A newer card may use a file system the host device cannot navigate (FAT32 for SDHC, exFAT for SDXC) Use of an SDIO card requires the host device be designed for the input/output functions the card provides. The hardware interface of the card was changed starting with the version 2.0 (new high-speed bus clocks, redefinition of storage capacity bits) and SDHC family (Ultra-high speed (UHS) bus) UHS-II has physically more pins but is backwards compatible to UHS-I and non-UHS for both slot and card. Some vendors produced SDSC cards above 1 GB before the SDA had standardized a method of doing so. Markets Due to their compact size, Secure Digital cards are used in many consumer electronic devices, and have become a widespread means of storing several gigabytes of data in a small size. Devices in which the user may remove and replace cards often, such as digital cameras, camcorders, and video game consoles, tend to use full-sized cards. Devices in which small size is paramount, such as mobile phones, action cameras such as the GoPro Hero series, and camera drones, tend to use microSD cards. Mobile phones The microSD card has helped propel the smartphone market by giving both manufacturers and consumers greater flexibility and freedom. While cloud storage depends on stable internet connection and sufficiently voluminous data plans, memory cards in mobile devices provide location-independent and private storage expansion with much higher transfer rates and no network delay, enabling applications such as photography and video recording. While data stored internally on bricked devices is