Secondary storage (NHẬP môn điện TOÁN SLIDE)

• Discuss the important characteristics of secondary storage, including media, capacity, storage devices, and access speed • Describe hard disk platters, tracks, sectors, and head cras

Chapter 08: Secondary

Storage Chapter 08: Secondary

Storage

• Discuss the important characteristics of

secondary storage, including media,

capacity, storage devices, and access speed

• Describe hard disk platters, tracks, sectors,

and head crashes

• Compare internal and external hard drives

• Discuss performance enhancements

including

disk caching, RAIDs, file compression, and

file decompression

• Define optical storage including compact,

digital versatile, and high-definition discs

• Define state storage, including

solid-state drives, flash memory, and USB drives

• Define cloud storage and cloud storage

services

• Discuss mass storage devices, enterprise

storage systems, and storage area

networks

and numeric files to include digital

music files, photographic files, video

files, and much more

secondary storage devices with much greater capacity

the many types of secondary

storage devices including their

capabilities and limitations.

• Secondary storage

characteristics

– Media – Capacity – Storage devices – Access speed

nonvolatile storage

retained after the computer

has been shut of

systems have both hard and

optical disk drives

– Internal Hard Disk – External Hard Disks

• A head crash is a disaster for a

hard disk, not to mention the

data stored on the disk

Return

u Internal Hard Disk

often designated as the C: drive

u External Hard Disks

disk with an unlimited amount of

additional storage

(TBs)

Return

hard disk performance

• Redundant arrays of

inexpensive disks (RAID)

to expand storage and

to improve access speed

• Rotation speeds vary

• Three basic types

– Read only (CD-ROM) – Write once (CD-R) – Rewriteable (CD-RW)

digital versatile disc or digital

• Next generation optical disc for

recording high-definition (hi def) video

• Capacity of 25 GB to 100 GB

• Blu-ray optical drives are usually

capable of reading standard

DVDs and CDs in addition to

Blu-ray discs

– Faster and more durable

• Flash memory cards

– Widely used in computers,

cameras, and portable devices such as mobile phones

• USB Drives (or Flash Drives)

– Compact and easily

transported

– Capacity of 1 GB to 256 GB

creating digital video simpler and

acts as a “cloud” of servers

– Applications provided as a service rather

than a product (for example, cloud or online storage)

• Cloud storage services

make it easy to

upload and share

files with anyone

u Mass Storage Devices

amounts of secondary storage called mass storage

security using specialized strategies and

needs and create application

computers and technology

– Communication and analytical skills

A Look to the Future

Your Entire Life Recorded on a Single Disk

• Future secondary storage disks

will eventually store terabytes

(TB) or petabytes (PB)

digital video on a single disc

that can scan photos and videos for a particular person’s face

Describe three ways to improve hard

disk performance.

storage.

common optical disc formats?

including enterprise storage systems

and storage area networks.