Chapter 7 Types of Storage PDF

Chapter 7 Types of Storage Discovering Computers 2012 Your Interactive Guide to the Digital World Objectives Overview Describe the characteristics of an internal hard dis...

Chapter 7 Types of Storage Discovering Computers 2012 Your Interactive Guide to the Digital World Objectives Overview Describe the characteristics of an internal hard disk including Differentiate between storage capacity, platters, read/write devices and storage media heads, cylinders, sectors and tracks, revolutions per minute, transfer rate, and access time Discuss the purpose of network attached storage devices, Describe the various types of external and removable hard flash memory storage disks, and hard disk controllers See Page 351 2 for Detailed Objectives Discovering Computers 2012: Chapter 7 Objectives Overview Describe cloud storage Describe the and explain its characteristics of optical advantages discs Differentiate among Identify the uses of tape, various types of optical magnetic stripe cards, discs: CDs, archive discs smart cards, microfilm and Picture CDs, DVDs, and microfiche, and and Blu-ray Discs enterprise storage See Page 351 3 for Detailed Objectives Discovering Computers 2012: Chapter 7 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 352 - 353 4 Discovering Computers 2012: Chapter 7 Storage Pages 352 – 353 5 Discovering Computers 2012: Chapter 7 Figure 7-1 Storage Capacity is the number of bytes a storage medium can hold Page 354 6 Discovering Computers 2012: Chapter 7 Figure 7-2 Storage A storage device is the computer hardware that records and/or retrieves items to and from storage media 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 Page 354 7 Discovering Computers 2012: Chapter 7 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 355 8 Discovering Computers 2012: Chapter 7 Figure 7-4 Hard Disks A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information Page 355 9 Discovering Computers 2012: Chapter 7 Figure 7-5 Hard Disks Hard disks can store data using longitudinal recording or perpendicular recording Page 356 10 Discovering Computers 2012: Chapter 7 Figure 7-6 Hard Disks Characteristics of a hard disk include: Read/Write Capacity Platters Heads Sectors and Revolutions Cylinders Tracks per Minute Transfer Access Time Rate Page 357 11 Discovering Computers 2012: Chapter 7 Figure 7-8 Hard Disks Formatting is the process of dividing the disk into tracks and sectors so that the operating system can store and locate data and information on the disk Page 357 12 Discovering Computers 2012: Chapter 7 Figure 7-7 Page 358 13 Discovering Computers 2012: Chapter 7 Figure 7-9 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 358 14 Discovering Computers 2012: Chapter 7 Figure 7-10 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 Pages 358 – 359 15 Discovering Computers 2012: Chapter 7 Figure 7-11 Hard Disks Page 359 16 Discovering Computers 2012: Chapter 7 Figure 7-12 Hard Disks RAID (redundant array of independent disks) is a group of two or more integrated hard disks A network attached storage (NAS) device is a server connected to a network with the sole purpose of providing storage Page 360 17 Discovering Computers 2012: Chapter 7 Figure 7-13 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 (miniature hard disks) Pages 360 – 361 18 Figures 7-14 – 7-15 Discovering Computers 2012: Chapter 7 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 SATA EIDE SCSI SAS Pages 361 - 362 19 Discovering Computers 2012: Chapter 7 Flash Memory Storage Flash memory chips are a type of solid state media and contain no moving parts Solid state drives (SSDs) have several advantages over magnetic hard disks: Generate less heat and Faster access time Faster transfer rates Last longer consume less power Pages 362 - 363 20 Discovering Computers 2012: Chapter 7 Flash Memory Storage Page 363 21 Discovering Computers 2012: Chapter 7 Figure 7-17 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 Secure Digital CompactFlash Secure Digital High Capacity microSD (CF) (SD) (SDHC) xD Picture Memory Stick microSDHC Memory Stick Card Micro (M2) Page 364 22 Discovering Computers 2012: Chapter 7 Pages 364 – 365 23 Figures 7-18 – 7-19 Discovering Computers 2012: Chapter 7 Pages 364 – 365 24 Figures 7-18 – 7-19 Discovering Computers 2012: Chapter 7 Page 366 25 Discovering Computers 2012: Chapter 7 Figure 7-20 Flash Memory Storage USB flash drives plug into a USB port on a computer or mobile device Page 367 26 Discovering Computers 2012: Chapter 7 Figure 7-21 Flash Memory Storage An ExpressCard module is a removable device that fits in an ExpressCard slot Developed by the PCMCIA Commonly used in notebook computers Page 367 27 Discovering Computers 2012: Chapter 7 Figure 7-22 Cloud Storage Cloud storage is an Internet service that provides storage to computer users Page 368 28 Discovering Computers 2012: Chapter 7 Figure 7-23 Cloud Storage Page 368 29 Discovering Computers 2012: Chapter 7 Figure 7-24 Cloud Storage Users subscribe to cloud storage for a variety of reasons: Access files from any computer Store large files instantaneously Allow others to access their files View time-critical data and images immediately Store offsite backups Provide data center functions Page 369 30 Discovering Computers 2012: Chapter 7 Optical Discs An optical disc consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser Typically store software, data, digital photos, movies, and music Read only vs. rewritable Page 370 31 Discovering Computers 2012: Chapter 7 Figure 7-25 Page 370 32 Discovering Computers 2012: Chapter 7 Figure 7-26 Optical Discs Optical discs commonly store items in a single track that spirals from the center of the disc to the edge Track is divided into evenly sized sectors Page 371 33 Discovering Computers 2012: Chapter 7 Figure 7-27 Optical Discs Care of optical discs Page 371 34 Discovering Computers 2012: Chapter 7 Figure 7-28 Optical Discs A CD-ROM can be read from but not written to Read from a CD-ROM drive or CD-ROM player A CD-R is a multisession optical disc on which users can write, but not erase A CD-RW is an erasable multisession disc Must have a CD-RW drive Pages 372 – 373 35 Discovering Computers 2012: Chapter 7 Figure 7-29 Optical Discs Archive disc Picture CD Stores photos from an Single-session CD-ROM online photo center that stores digital Resolution usually is versions of film 7200 pixels per photo Typically uses a 1024 x Cost is determined by 1536 resolution the number of photos Many photo centers being stored offer Picture CD services Page 374 36 Discovering Computers 2012: Chapter 7 Page 374 37 Discovering Computers 2012: Chapter 7 Figure 7-31 Optical Discs A DVD-ROM is a high-capacity optical disc on which users can read but not write or erase Requires a DVD-ROM drive A Blu-ray Disc-ROM (BD-ROM) has a storage capacity of 100 GB DVD-RW, DVD+RW, and DVD+RAM are high- capacity rewritable DVD formats Pages 375 – 376 38 Discovering Computers 2012: Chapter 7 Figure 7-29 Other Types of Storage Page 376 39 Discovering Computers 2012: Chapter 7 Other Types of Storage Tape is a magnetically coated ribbon of plastic capable of storing large amounts of data and information A tape drive reads and writes data and information on a tape Page 376 40 Discovering Computers 2012: Chapter 7 Figure 7-35 Other Types of Storage A magnetic stripe card contains a magnetic stripe that stores information A smart card stores data on a thin microprocessor embedded in the card Page 377 41 Discovering Computers 2012: Chapter 7 Figure 7-36 Other Types of Storage Microfilm and microfiche store microscopic images of documents on a roll or sheet film Page 378 42 Discovering Computers 2012: Chapter 7 Figure 7-37 Other Types of Storage Page 378 43 Discovering Computers 2012: Chapter 7 Figure 7-38 Other Types of Storage Enterprise storage stores huge volumes of data and information for large businesses – Uses special hardware for heavy use, maximum availability, and maximum efficiency Page 379 44 Discovering Computers 2012: Chapter 7 Figure 7-39 Putting It All Together Home user Small Office/Home Office Mobile 500 GB hard disk user 250 GB hard disk Cloud storage 1 TB hard disk Cloud storage Optical disc drive Cloud storage Optical disc drive Card reader/writer Optical disc drive Card reader/writer USB flash drive External hard disk for Portable hard disk for backup backup USB flash drive USB flash drive Page 380 45 Discovering Computers 2012: Chapter 7 Figure 7-40 Putting It All Together Power User Enterprise User Enterprise User 2.5 TB hard disk (desktop computer) (server or mainframe) Cloud storage 1 TB hard disk Network storage server Optical disc drive Optical disc drive 40 TB hard disk system Portable hard disk for Smart card reader Optical disc server backup Tape drive Microfilm or microfiche USB flash drive USB flash drive Page 380 46 Discovering Computers 2012: Chapter 7 Figure 7-40 Summary Internal hard disks, external and removable hard disks, solid state drives, memory cards, USB flash Various storage media and drives, ExpressCard modules, storage devices cloud storage, CDs, DVDs, and Blu-ray Discs, tape, smart cards, and microfilm and microfiche Page 381 47 Discovering Computers 2012: Chapter 7 Chapter 7 Types of Storage Discovering Computers 2012 Your Interactive Guide to the Digital World Chapter 7 Complete