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CUT6 3.8
Computers: Understanding Tech 6e 3.8
Term | Definition |
---|---|
primary storage | Storage where data is placed immediately after it’s input or processed. Primary storage is by nature temporary. Generally, the term primary storage refers to dynamic RAM. |
secondary storage | Storage that holds data until the data is removed from it intentionally. Generally, the term secondary storage refers to storage volumes such as hard drives. |
fixed storage | Storage that is mounted inside the computer; to get it out, you would have to open up the computer’s case. An internal hard disk drive is an example. |
removable storage | Storage media that can easily be separated from the computer. CDs, DVDs, external hard drives, and USB flash drives are all examples. |
hard disk drive (HDD) | A mechanical hard drive consisting of one or more rigid metal platters (disks) mounted on a spindle in a metal box with a set of read/write heads—one read/write head for each side of each platter. |
track | A numbered, concentric ring or circle on a hard disk. |
sector | A numbered section of a track on a hard disk. |
cluster | On a storage disk, a group of sectors that are addressed as a single unit. |
master file table (MFT) | The table of contents on an NTFS volume. |
file allocation table (FAT) | The disk’s table of contents on a FAT or FAT32 volume. |
New Technology File System (NTFS) | The file system used in modern versions of Windows. |
magnetic storage | A type of disk storage that stores data in patterns of transitions created by magnetizing areas of the disk with a positive or negative polarity. |
flux transition | In magnetic storage, a transition point between positive and negative magnetic polarity on the disk surface. |
average access time | The average amount of time between the operating system requesting a file and the storage device delivering it. |
data transfer rate | The speed at which data can be moved from the storage device to the motherboard and then on to the CPU. |
parallel ATA (PATA) | A hard disk interface that uses a 40-wire ribbon cable to transfer data in parallel fashion; limited to about 133 megabytes per second; mostly obsolete, having been superseded by serial ATA (SATA). |
serial ATA (SATA) | A hard disk interface that transfers data in serial fashion at up to 308 megabytes per second; used on most desktop and notebook systems today. |
solid-state hard drive (SSHD) | The solid-state equivalent of a mechanical hard disk drive (HDD) in terms of storage capacity and physical size of the box. |
network share | A drive or folder that’s been made available to users on computers other than the one on which the content physically resides. |
cloud drive | A secure storage location on an Internet-accessible remote server. Examples include Microsoft’s OneDrive and Apple’s iCloud. |
optical disc | A disc that stores data in patterns of greater and lesser reflectivity on its surface. CDs and DVDs are optical discs. |
optical drive | A drive that contains a laser that shines light on the surface and a sensor that measures the amount of light that bounces back. CDs and DVDs are read and written in optical drives. |
land | Areas of greater reflectivity on the surface of an optical disc. Compare pit. |
pit | Area of lesser reflectivity on the surface of an optical disc. Compare land. |
compact disc (CD) | An optical disc that can store up to 900 MB of data; commonly used for distributing music and small applications and for inexpensively storing and transferring data. |
digital versatile disc (DVD) | An optical disc that can store up to 17 GB of data, although the most common type (single-sided, single layer) stores up to 4.7 GB of data; most often used to distribute large applications and standard-definition movies. |
Blu-ray disc (BD) | An optical disc that can store up to 128 GB of data in up to four layers; used to distribute high-definition movies and to store and transfer large amounts of data. |