Lecture 06 Ch08 Digital Storage.pptx

Chapter 8 Digital Storage 1 Objectives Overview Describe the Differentiate Describe the characteristics between storage...

Chapter 8 Digital Storage 1 Objectives Overview Describe the Differentiate Describe the characteristics between storage benefits of solid- of internal hard and memory state drives disks Differentiate among various Identify uses of types of external hard memory cards disks and RAID and USB flash drives See Page 368 2 for Detailed Objectives Objectives Overview Describe Discuss the characteristics of benefits and uses and differentiate of cloud storage among types of optical discs Identify uses of Explain types of magnetic stripe enterprise cards, smart storage cards, RFID tags, and NFC tags See Page 368 3 for Detailed Objectives Content 1. Storage medium/devices 2. Data representation © 2017 Cengage Learning®. May not be scann 4 ed, copied or duplicated, or posted to a publicl 1. Storage A storage medium is the physical material on which a computer keeps data, information, programs, and applications Cloud storage keeps information on servers on the Internet, and the actual media on which the files are stored are transparent to the user Page 368 5 Storage A storage device is the hardware that records and/or retrieves items to and Reading is the from storage media process of transferring items from a storage medium into memory Writing is the process of transferring items from memory to a storage medium Page 368 6 Storage Page 369 7 Figure 8-1 Storage Capacity is the number of bytes a storage medium can hold Page 370 8 Table 8-1 Storage Items on a storage medium remain intact even when you turn off a computer or mobile device Pages 370 - 371 9 Figure 8-2 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 371 10 Figure 8-3 Hard Drives A hard disk, also called a hard disk drive (HDD) contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information Page 373 11 Figure 8-4 Hard Drives The storage capacity of hard disks varies and is determined by: – The number of platters the hard disk contains – Whether the disk uses longitudinal or perpendicular recording – Density Page 374 12 Hard Drives Formatting is the process of dividing the disk into tracks and sectors Page 374 13 Figure 8-5 Hard Drives Characteristics of a hard disk include: Tracks Sectors Platters Read/ Revolutio Form write ns per factor head minute Pages 374 - 375 14 Hard Drives Page 375 15 Figure 8-6 Hard Drives A head crash occurs when a read/write head touches the surface of a platter Always keep a backup of your hard disk Page 375 16 Figure 8-7 Hard Drives An SSD (solid state drive) is a flash memory storage device that contains its own processor to manage its storage An SSD (solid state drive) has several advantages over traditional (magnetic) hard disks: Faster access Faster Quieter Lighter More durable times transfer rates operation weight Defragmenta Less power Less heat Longer life tion not consumption generation required Pages 376 - 378 17 Hard Drives An external hard disk is a separate freestanding storage device that connects with a cable to a USB port or other port on a computer or mobile device Pages 378 - 379 18 Figure 8-9 Hard Drives RAID (redundant array of independent disks) is a group of two or more integrated hard disks or SSDs Page 380 19 Figure 8-10 Portable Flash Memory Storage A memory card is a removable flash memory storage device that you insert and remove from a slot in a computer, mobile device, or card reader/writer microSDH microSDX SDHC SDXC miniSD C C xD Memory CF Picture Stick PRO M2 Card Duo Page 381 20 Portable Flash Memory Storage Page 381 21 Figure 8-11 Portable Flash Memory Storage Page 382 22 Figure 8-12 Portable Flash Memory Storage USB flash drives plug into a USB port on a computer or mobile device Pages 382 - 383 23 Figure 8-13 Cloud Storage Cloud storage is an Internet service that provides storage to computer or mobile device users Pages 383 - 384 24 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 Page 386 25 Figure 8-14 Optical Discs Page 386 26 Figure 8-15 Optical Discs Optical discs commonly store items in a single track that spirals from the center of the disc to the edge of the disc Track is divided into evenly sized sectors Page 387 27 Figure 8-16 Optical Discs A CD-ROM can A CD-R is an be read from optical disc on but not written which users can to write once, but Single-session disc not erase A CD-RW is an erasable multisession disc Page 388 28 Optical Discs A DVD-ROM is a high-capacity optical disc on which users can read but not write on or erase A DVD-R or DVD+R are competing DVD- recordable WORM formats, on which users can write once but not erase DVD-RW, DVD+RW, and DVD+RAM are competing DVD-rewritable formats that users can write on multiple times Page 388 29 Enterprise Storage Enterprise hardware allows large organizations to manage and store data and information using devices intended for heavy use, maximum efficiency, and maximum availability – RAID duplicates data, instructions, and information to improve data reliability Pages 389 – 390 30 Figure 8-18 Enterprise Storage Network attached storage (NAS) is a server that is placed on a network with the sole purpose of providing storage to users, computers, and devices attached to the network Pages 390 – 391 31 Figure 8-19 Enterprise Storage A storage area network (SAN) is a high-speed network with the sole purpose of providing storage to other attached servers Page 391 32 Figure 8-20 Enterprise 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 magnetic tape Page 392 33 Figure 8-21 How to represent data and store data? Next lectures: – Number system – Data representation © 2017 Cengage Learning®. May not be scann 34 ed, copied or duplicated, or posted to a publicl Summary Characteristics Storage of hard disks, Variety of capacity and SSDs, external storage options storage access hard drives, times and RAID Advantages Portable flash and various Characteristics memory uses of cloud of optical discs storage storage Magnetic stripe cards, smart Enterprise cards, RFID storage options tags, and NFC chips and tags Page 397 35