7/17/11 8-2 Competencies ! " Distinguish between primary & secondary storage SECONDARY ! " Discuss the different types of storage media STORAGE ! " Describe the traditional floppy disk and the high capacity floppy disks ! " Describe various types of hard disk devices © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-3 8-4 Competencies cont. Storage ! " Describe ways to improve hard-disk operations ! " Primary storage ! " Secondary storage ! " Describe the different types of optical disks ! " Volatile ! " Nonvolatile ! " Temporary ! " Permanent ! " Describe other kinds of secondary storage ! " Secondary storage devices characteristics ! " Media ! " Capacity ! " Storage devices ! " Access speed © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-5 8-6 Secondary Storage Devices Magnetic Tape ! " External storage ! " Provides sequential access ! "Information stored in sequence ! "Slower than disks which provide direct access ! " Magnetic tape streamers or tape cartridges used by both mainframes and microcomputers © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 1 7/17/11 8-7 8-8 Traditional Floppy Disks Types of Floppies ! " High capacity ! " Traditional ! " Known as a floppy-disk cartridge ! "Floppies ! " Require special disk drives ! "Diskettes ! " Three well known types ! "Portable storage ! "Zip disks media ! "HiFD disks ! " Floppy disk drives Traditional Floppy Diskette ! "SuperDisks (FDD) © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-9 8-10 Hard Disks Hard-Disk Cartridges ! " Use thicker, metallic platters for storage ! " Removable hard disks ! " Internal (fixed) or external ! " Faster access speed than a floppy diskette ! " Used to complement internal hard disk ! " Direct or random access to data ! " Large capacity ! " Capacities of 10 to 20 GB ! " Sensitive instruments PC Card Hard Disks © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-11 8-12 Hard-Disk Packs Performance Enhancements ! " Removable ! " Disk caching ! " Massive storage capacity ! " Common in mainframes ! " Redundant arrays of ! " Resembles stack of vinyl records inexpensive disks (RAID) ! " File compression and decompression ! " Defragmentation © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 2 7/17/11 8-13 8-14 Optical Disks Compact Disc ! " Compact ! " Optical format ! " Permanent storage ! " From 650 MB to 1 GB capacity ! " Laser beams reflect off pits ! " Rotation speeds vary ! " Two common types ! " Types ! "CD ! "Read only: CD-ROM ! "DVD ! "Write once: CD-R ! "Rewriteable: CD-RW ! "Picture CDs and Photo CDs © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-15 8-16 Digital Versatile Disc Blu-Ray Technology ! " Digital Versatile Disk or Digital Video Disk ! " New standard in storage (DVD) ! " Blu-Ray ! " Similar to CDs, but can store more data ! "New disks use blue laser light instead of the red laser ! " Types light used in traditional CD players ! "Read only: DVD-ROM ! "Disks may ultimately hold ! "Over 30GB on one-sided disks ! "Write once: DVD-R ! "Over 50GB on two-sided disks ! "Rewritable: DVD-RW © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-17 8-18 DataPlay Solid-State Storage ! " Optical disk ! " Flash memory cards ! " Write once format ! "Widely used in notebook computers ! " Quarter size ! "Used to record MP3 music files ! "500 MB capacity ! "Expanded digital camera use ! "Holds 5 hours of CD-quality sound ! " Key chain hard drives ! " Use for storing and playing ! "Key chain flash memory music files devices ! "Connects to a USB port © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 3 7/17/11 8-19 8-20 Internet Hard Drives FAQs ! " What is the difference between primary storage and secondary storage? ! " What kind of data access do floppy and hard drives use ? ! " What is the C drive of a computer? ! " When would I use a hard-disk cartridge? ! " What is the difference between a CD and a DVD? © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-21 8-22 Discussion Questions Participation Question ! " Discuss three ways to improve the performance Optical disks that can be written on only once are of hard disks. called identified as ____ . ! " Describe the different types of compact discs. ! " Describe the different types of DVDs. A. " CD-ROM ! " What are the advantages and disadvantages of B. " CD-R using an Internet hard drive? C. " CD-RW ! " Describe solid state technology. Discuss the D. " CD-DVD many uses for key chain flash memory devices. E. " CD-W © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 4 .