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SECTION D: Today's digital devices use a variety of DVD, or BD. state storage technolo- storage technologies. storage tech- gies, such as USB flash drives, store data by activating elec- nologies, such as hard disks, store data as particles ori- trons in a microscopic grid of circuitry. A backup is a copy ented north or south. A hard disk drive provides multiple of one or more files that have been made in case the original for data storage that are sealed inside files become damaged. A good backup plan allows you to the drive case to prevent airborne contaminants from inter restore a device's operating system, software, data files, set- fering with the read-write heads. Hard disks are less durable tings, accounts, and profiles in case of a massive hardware than many other types of storage, so it is important to make failure or virus infection. Personal computer backups are typi- a copy of the data they contain stor. cally recorded on hard drives, USB age technologies store data as a series of dark spots and flash drives, network servers, and online storage services. An light spots on the surface of CDs, DVDs, or BDs. Storage easy way to get a backup of important data files is to use the technologies, such as CD-L J. are often command to make duplicates and store used for distributing software, but you cannot alter the disc's them on a USB drive. Backup utilities such as File History and contents. technology allows you to Time Machine use a technique called file write data on a CD, DVD, or BD, but you cannot delete or to make sure that files on two devices are the same. A disk change that data. Rerecordable or is a bit-for-bit copy of the data from all technology allows you to write and erase data on a CD, sectors of a hard disk. SECTION E: Inside a digital device, a data tion. Touchscreens use either or capac- connects the processor to RAM, and itive technology to process gestures. Display devices receive connects RAM to a series of expansion J. images from graphics circuitry. A(n) and There are four technologies commonly used for general- special video memory can enhance graphics processing and purpose ports: Thunderbolt, FireWire, Lightning, and free the main processor for other tasks. For printed output, J. For video devices, the most com- most personal computer owners select mon ports are VGA, DVI, J. and Mini jet printers, though printers are a popu- DisplayPort. Peripherals can be inserted or removed while Iar option when low operating costs and high duty cycle are the host device is on, but storage devices should not be important. The Internet of is a tech- removed without notification. To connect additional peripher- nology that links smart sensors. Some of these sensors can als when all USB ports are full, it is possible to use a USB also be found in smartphones and autonomous vehicles J. Some peripherals can be connected A(n) can sense if a laptop computer is wirelessly using technology. The soft- dropped or if a car brakes suddenly. A(n)L ware that helps a peripheral device establish communication sensor measures angular velocity. A(n)L with its host device is called a device can be used as a compass for navigation and map displays Most devices include an) crystal dis- Autonomous vehicles use sensor data as input to sense-plan- play. Image quality for a display device is a factor of screen algorithms processed on an onboard size, response rate, dot . and resolu- computer