Storage - Discovering Computers Fundamentals - Lecture Slides, Slides of Computer Fundamentals

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Storage docsity.com

Objectives Overview

Describe the characteristics of an internal hard disk including capacity, platters, read/write heads, cylinders, sectors and tracks, and revolutions per minute Discuss the purpose of network attached storage devices, external and removable hard disks, and hard disk controllers Describe the various types of flash memory storage Describe cloud storage and explain its advantages See Page 237 for Detailed Objectives docsity.com

Storage

Storage holds data, instructions, and

information for future use

A storage medium is the physical

material on which a computer keeps

data, instructions, and information

Pages 238 - 239 docsity.com

Storage

Pages 238 – 239 Figure 6- 1 docsity.com

Storage

• A storage device is the computer hardware that records and/or retrieves items to and from storage media Page 240 Reading is the process of transferring items from a storage medium into memory Writing is the process of transferring items from memory to a storage medium docsity.com

Storage

• Access time measures:
  • The amount of time it takes a storage device to locate an item on a storage medium
  • The time required to deliver an item from memory to the processor Page 240 docsity.com

Hard Disks

• Hard disks can store data using longitudinal recording or perpendicular recording Page 356 Click to view Web Link, click Chapter 6, Click Web Link from left navigation, then click Perpendicular Recording below Chapter 6 docsity.com

Hard Disks

• Characteristics of a hard disk include: Page 242 Figure 6- 5 Capacity Platters Read/Write Heads Cylinders Sectors and Tracks Revolutions per Minute Transfer Rate Access Time docsity.com

Hard Disks

• The hard disk arms move the read/write head, which reads items and writes items in the drive - Location often is referred to by its cylinder Page 243 Figure 6- 7 docsity.com

Hard Disks

• A head crash occurs when a read/write head touches the surface of a platter
• Always keep a backup of your hard disk Page 244 Figure 6- 8 docsity.com

Hard Disks

An external hard disk is a separate free- standing hard disk that connects to your computer with a cable or wirelessly A removable hard disk is a hard disk that you insert and remove from a drive Internal and external hard disks are available in miniature sizes ( pocket hard drive ) Pages 244 – 3245 Figures 6- 9 – 6 - 10 docsity.com

Hard Disks

• A disk controller consists of a special-purpose chip and electronic circuits that control the transfer of data, instructions, and information from a disk to and from the system bus and other components of the computer Page 246

SATA EIDE

Click to view Web Link, SCSI SAS

click Chapter 6, Click Web Link from left navigation, then click eSATA below Chapter 6 docsity.com

Flash Memory Storage

Page 247 Figure 6- 12 Click to view Web Link, click Chapter 6, Click Web Link from left navigation, then click Solid State Drives below Chapter 6 docsity.com

Flash Memory Storage

• A memory card is a removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader/writer Page 248 CompactFlash ( CF ) Secure Digital ( SD ) Secure Digital High Capacity ( SDHC ) microSD microSDHC xD Picture Card Memory Stick Memory Stick Micro ( M2 ) docsity.com