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Operating Systems CH7
Operating Systems Chapter 7
42
Computer Science
Undergraduate 4
09/29/2012

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Term
Advanced Intelligent Tape
Definition
A tape drive that has an erasable memory chip and has a capacity of up to 1.3TB.
Term
ATA
Advanced Technology Attachment
Definition
The name of the ANSI standard for an integrated drive electronics interface (IDE). Standard ATA is also called Parallel ATA (PATA), because it uses a parallel connection.
Term
American National Standards Institute
ANSI
Definition
An organization that works to set standards for all types of products, including computer and networking devices.
Term
Basic Disk
Definition
A physical hard drive used in windows that offers essential disk management options. It can contain primary partitions, extended partitions, or logical drives that are known as basic volumes.
Term
Cloud Storage
Definition
Storage that is used through the internet or a network via a web-based interface or software, such as a browser.
Term
Compact Disc
CD
Definition
A disc formed of a polycarbonate (chain of molecules of carbon, hydrogen, and oxygen) plastic that has a reflective optical surface that can be read by a laser. CD's are used to store information, such as data or audio and video information that can be accessed on a DVD/CD-ROM drive.
Term
Compact Disc read only memory
CD-ROM
Definition
A CD that sues a technology in which information, suchas data or music is pressed onto the disc one time, so that it can be read or played many times. CD-ROMS are generally used for mass distribution of software or music.
Term
Compact Disc Recordable
CD-R
Definition
A CD that is created by burning information onto the disc by a laser. information on a CD-R is written to the disc one time and can be read time after time. This is the type of disc you use when you burn a disc on your computer.
Term
CD-RW
Definition
A CD medium that enables you to record information from your computer to a CD multiple times. Before rewriting, the disc is blanked so that it can hold new information.
Term
CRCC
Cyclic Redundancy Check Code
Definition
A data error correction method that uses an algebraic polynomial and error key to detect and overcome errors. This is a method frequently used on storage media as well as in network communications.
Term
DAT
Digital Audio Tape
Definition
A tape system that uses 4-mm tape and has a capacity of up to 72GB
Term
DLT
Digital Linear Tape
Definition
A tape system that uses half-inch magnetic tapes and has a capacity of up to 1.6TB.
Term
DVD
Digital Video Disc or Digital Versatile Disc
Definition
High capacity removable disc storage that typically uses a disc similar in appearance to CD's and that stores high-quality audio, motion video, and computer data.
Term
DVD-R
Digital Video or Versatile
Disc-recordable
Definition
A recordable DVD technology that uses a similar technology to CD-R in that medium can be burned once and ready many times.
Term
DVD+R
Digital Video or Versatile
Disc-Recordable
Definition
A recordable DVD technology in which the medium can be burned once and read many times. This is a slightly newer technology than DVD-R with a different tracking method.
Term
Disk Geometry
Definition
Critical information about a hard drive's hardware configuration. This information is often stored in an area of nonvolatile memory in the computer.
Term
Disk Mirroring
Definition
A fault tolerance method in which the contents of one disk are exactly duplicated or mirrored on another disk, so that if the main disk fails the second disk can be brought into operation without losing even newly created data.
Term
Dynamic Disk
Definition
Used by Windows operating systems to provide the option to create volumes that span multiple disks and to provide more security and management features than basic disks.
Term
EIDE
Enhanced IDE
Definition
A more modern, faster version of IDE, also referred to as the ANSI ATA-2 standard.
Term
Error Concealment
Definition
An error correction method that uses surrounding data to help calculate approximate data to fill in for the missing data.
Term
ECC
Error Correction Code
Definition
A data error correction technique that can replace errors by adding duplicate or parity data so that missing data can be recovered.
Term
eSATA
External SATA
Definition
An interface that enables connectivity for an external SATA drive.
Term
Fault Tolerance
Definition
Implementing software or hardware to protect against hardware failures, power interruptions, and lost data.
Term
Fibre Channel
Definition
A means of transferring data between servers, mass storage devices, workstations, and peripherals at very high speeds.
Term
Flash or Thumb Drive
Definition
Avery portable storage medium that typically plugs into a USB port and has no internal moving parts. Data on a flash drive can be written, deleted, and modified.
Term
GUID
Globally Unique Identifier Partition Table or GPT
Definition
A partition table approach that is newer than the MBR approach and theoretically sets no limits to the number of partitions on a disk. Further, it enables the use of larger disks, such as in the exabyte range.
Term
HDCP
High-Bandwidth Definition or
Digital Content protection
Definition
A digital copy protection method that helps ensure digital content cannot be pirated.
Term
InfiniBand
Definition
A technology designed for ultra-fast communications connectivity in data centers, such as linking one server to another for clustering servers to act as one powerful server. In a storage area network, this technology can be sued as an alternative to Fibre Channel for fast access to data.
Term
IDE
Integrated Drive Electronics
Definition
A storage protocol used in older desktop computer systems. IDE simplifies the hardware required inside the computer, placing more of the disk intelligence at the hard drive itself. This is also referred to as the ANSI ATA standard.
Term
iSCSI
Internet Small Computer System interface
Definition
A network attached storage technology that uses TCP/IP network communications and SCSI drives and commands.
Term
Light Peak
Definition
A computer peripheral device connection technology that uses optical cables instead of copper cables and has faster communications than USB.
Term
LTO
Linear Tape Open
Definition
A tape drive used in the high end server market with a storage capacity of up to 1.6TB.
Term
NAS
Network Attached Storage
Definition
A way to directly attach storage to a network for access by or more servers or storage clients.
Term
Parity
Definition
A simple error detection method that typically counts the number of non-zero bits in a string of data and then sets a parity bit to reflect whether the number of non-zero bits totals to an even number or an odd number. if the total is an even number, it sets the parity bit to (equal 1) and if the total is odd, then it does not set the parity bit(which equals to 0).
Term
RAID
Redundant Array of Inexpensive (or independent) Disks
Definition
A relatively inexpensive, redundant storage design that uses multiple disks and logic to reduce the chance of information being lost in the event of hardware failure. RAID uses various designs, typically designated as Level 0 through Level 5.
Term
R-S Codes
Reed-Solomon
Definition
An error detection and correction approach developed by Irving Reed and Gustave Solomon that uses a complex polynomial technique for addressing data errors.
Term
SATA
Serial Advanced Technology Attachment
Definition
A high-speed interface used for hard disk and other communications that uses a high-speed serial cable connection for data transfer speeds up to 6Gbps.
Term
SSD
Solid State Drive
Definition
A storage technology that is based on using semiconductors for storage, similar tot he technology used in flash drives. SSD's have no moving parts, such as motors and spinning platters, and offer storage capacities approaching those used in magnetic-based hard-disks.
Term
SAN
Storage Area Network
Definition
A grouping of storage devices, such as hard drives, that form a subnet, or small private network. SAN technology provides for interconnection between servers and storage systems without sending data over the corporate network.
Term
S-AIT
Super Advanced Intelligent Tape
Definition
A tape system technology that has an erasable memory chip in the tape and a capacity of up to 1.3TB.
Term
SDLT
Super Digital Linear Tape
Definition
A tape system that uses magnetic and optical recording and has a tape capacity of up to 2.4 TB.
Term
Terminator
Definition
An electronic resistor used at the end of a cable and that absorbs the electronic signal so that the signal is not reflected back onto the cable. terminators are used in SCSI devices and on a network cable.
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