chapter 3

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chapter 3 storage

Recordable Discs

BD-R Discs

DVD-R

CD-R,

Flash Memory

USB Flash Drives

Flash Memory Cards

Rewritable Discs

BD-RE Discs

CD-RW, DVD-RW, DVD+RW

Volatility

Conventional RAM is volatile so programs and documents held in RAM are erased when they are no longer nedded by the computer or when a power turned off.

Read-Only Discs

BD-ROM Discs

DVD-ROM

CD-ROM

Type of Storage Technology Used

Internal and External Hard Drives

Internal hard drivers are located inside a computer system unit and are not removed unless there is a problem.

due to a large capacity , full sized external hard drives which are magnatic hard drives and hold between 500 GB and 4 recorded TVshows.

solid state drivers

A hard drive that uses flash memory media instead of metal magnatic hard disk and magnetic technology.

are an especially attractive option for portable computer or mobile devices

magnetic hard

Traditional hard drivers are magnatic hard drivers that contain magnatic hard disks /read wite heads, and acess mechanism.

hard drive

: is a primary storeage system for most computers used to store most programs and data used with a computer

Storage System Characteristics

All storage system have specific characterstic inclusing storage medium and a storage devic, portability and volatility.

Storage Media and Storage Devices

Storage medium: - the part of a storage system where data is stored , such as a DVD disc.

Storage device:- a pice of hardware sucha as a DVD drive

Optical Discs

optical drivers

representation data on it

Random

folder

filename

file

Random and Sequential Access