Mobile devices need a place to store data and mobile storage uses the same technology as some PC storage, but of course, the storage media is smaller. Mobile devices do have RAM. Sometimes this RAM is not upgradable in mobile devices such as tablets and smartphones. However, storage in mobile devices is sometimes available using flash memory.
Flash memory is a type of nonvolatile, solid-state memory that holds data even when the computer power is off. Smartphones, tablets, and other mobile devices use flash memory to store the operating system, apps, and data/video storage. Flash memory for mobile devices includes various types of Secure Digital (SD) cards: SD, miniSD, microSD, SDHC, miniSDHC, microSDHC, SDXC, microSDXC, extreme digital (xD), and probably more since this book has been published. On some phones, the micro memory chip is found when removing the back cover and the battery.
Another flash technology used with mobile devices is CompactFlash. CompactFlash (CF) has two main standards: CompactFlash and CF+. CompactFlash is a small, 50-pin removable storage device that allows speeds up to 133MB/s. CF cards can store 512GB or more. The CF+ standard allows increased functionality with cards available for Ethernet, fax/modem/wireless, and barcode scanners.
CF cards can be inserted directly into many devices, such as cameras, smartphones, network devices, and tablet PCs. A CF card uses flash memory, which does not require a battery to keep the data saved to it. A CF card can also be installed into a computer with a CF card reader. The CF technology is also used in solid-state drives.
Flash memory or storage cards are found in mobile devices and laptops, but also in desktop computers. Some mobile phones have an SD card slot built into the devices, some have an SD tray that pulls out. Insert the flash card into the tray (with the contacts facing down), and then push the tray into the device. Sometimes in order to insert a micro SD card into a tablet, an adapter may have to be purchased so that the micro SD card can be used.
Flash media is commonly installed in Apple and Android products. When you install flash media into an Android tablet or phone, you can use the Settings > Storage option to view the internal memory capacity and any additional memory storage. For an iOS-based device, go to Settings > General to see the amount of memory installed.
Some people like to buy a media card reader (also known as a multi-card reader or flash).