CTA Chapter 7

lands

1 and 0s are represented by flat areas called lands on the disc surface

storage area network (SAN)

An architecture used for disk arrays, tape libraries, and optical jukeboxes to appear as locally attached drives on a server.

platters

Are used by hard disks. They are stacked on top of each other and metallic.

internal hard disc

Located inside the system unit. These hard disks are able to store and retrieve large quantities of information quickly. They are used to store programs and data files

disaster recovery specialists

Responsible for recovering systems and data after a disaster strikes an organization. in addition, they often create plans to prevent and prepare for such disasters.

secondary storage devices

Such as a hard-disk drive, data and programs can be retained after the computer has been shut off. This is accomplished by writing files to and reading files from these.

primary storage

Temporary storage on the motherboard used by the CPU to process data and instructions. Memory is considered primary storage. What RAM is referred to as because data must be in RAM before data can be processed

network attached storage (NAS)

a type of file server designed for homes and small businesses

disadvantages to cloud storage

access speed, file security

online storage

aka cloud storage (think Google Drive)

pits

bumpy areas on the disc surface

optical discs

can hold over 128 gigabytes of data and are very common with most software and many movies available

file servers

dedicated computers with very large storage capacities that provide users access to fast storage and retrieval of data

solid-state drives (SSDs)

designed to be connected inside a personal computer system the same way an internal hard disk would be but contain solid-state memory instead of magnetic disks to store data

Write-once (R for recordable) discs

discs that can be written on once

Read-only (ROM for read-only memory) discs

discs that cannot be written on or erased by the user

storage devices

hardware that reads data and programs from storage media. Most also write storage media.

organizational cloud storage

high speed Internet connection to a dedicated remote storage facility

redundant arrays of inexpensive disks (RAID)

improve performance by expanding external storage, improving access speed, and providing reliable storage

disc caching

improves hard-disk performance by anticipating data needs

file compression and file decompression

increase storage capacity by reducing the amount of space required to store data and programs

RAID systems

larger versions of the specialized devices discussed earlier in this chapter that enhance organizational security by constantly making backup copies of files moving across the organization's networks.

benefits of online/cloud storage

maintenance, hardware upgrades, file sharing and collaboration

capacity

measures how much a particular storage medium can hold

access speed

measures the amount of time required by the storage device to retrieve data and programs.

head crash

occurs when a read-write head ,makes contact with the hard disk's surface or with particles on its surface.

flash memory

offers a combination of features of RAM and ROM and is also known as solid state storage

secondary storage

provides permanent or nonvolatile storage

mass storage

refers to the tremendous amount of secondary storage required by large organizations

tracks

rings of concentric circles on the platter and are divided into invisible wedge-shaped sections

cylinders

runs through each track of a stack of platters and are necessary to differentiate files stored on the same track and sector.

hard disks

save files by altering the magnetic charges of the disk's surface to represent 1s and 0s

Rewritable (RW for rewritable or RAM for random-access memory) discs

similar to write-once discs except that the disc surface is not permanently altered when data is recorded

flash memory cards

small solid-state storage devices widely used in portable devices

USB/flash drives

so compact that they can be transported on a key ring, they connect directly to a computer's USB port to transfer files.

mass storage devices

specialized high capacity secondary storage devices designed to meet organizational demands for data storage

solid-state storage

stores data using solid-state electronics such as transistors, and unlike magnetic and optical media, does not require any moving mechanical parts

enterprise storage system

strategy that is established by most large organizations to promote efficient and safe sue of data across the networks within their organizations

sectors

the invisible web shaped sections of tracks.

blue-ray discs (BDs)

the newest form of optical storage designed to store hi def video. The name comes from a special blue-colored laser used to read the discs

media

the physical material that holds the data and programs

digital versatile discs (DVDs)

the standard optical discs in PCs. DVDs are very similar to CDs except that typical DVD discs can store 4.7 GB (gigabytes)—seven times the capacity of CDs.

cloud computing

use of web services to perform functions that were traditionally performed with software on an individual computer; i.e. Flickr, Google Docs, etc.

external hard drives

use the same basic technology as internal hard disks and are used primarily to complement an internal hard disk

hi-def (high-definition)

uses HD 720 and HD 1080 resolutions

compacted discs (CDs)

were the first widely available optical format for PC users. they usually store 700 MB (megabytes) of storage.

optical disc drive

what the disc is read by, it uses a laser that projects a tiny beam of light on these areas