CHAPTER 7 Storage2. Floppy Disks课件-优质公开课-人教高中选修计算机英语精品
初二牛津课本课件(第7单元)
7. Why do Tina’s parents never say ‘no’ to her? Because they want Tina to have a happy childhood. 8. Are there any rules for Tina to watch TV?
How many hours does her watch TV for each week?
11. take full responsibility for … 负全责 12. buy sth. for sb. 为…某人买 13. look after oneself 自己照顾自己 14. pay sb. for doing sth. 为…付钱 15. complain to sb. about sth. 向某人抱怨某事 16. expect things for nothing 无故要求东西 17. cook a meal 做饭 18. a generous amount of money 大量的钱 19. have a happy childhood 拥有快乐的童年 20. disturb sb. 打扰某人
1.pocket money a generous amount ___ ____does it 2.housework seldom _____ It is the job ___the parents. of _____ ____ 3.presents
gets____ ____ lots of _____ presents. __________ 4.parents never saying'no' fifteen hours _____each week seven hoursweek watching _____each
人教版 高中 英语 选修 7 unit 2 robots-reading课件(共19张ppt)
have feelings?
have its own needs and desires?
look and feel like a human being?
Science fiction Intelligent and powerful
How absurd, she thought. He was just a machine.
He held her firmly in his arms …
Then she remembered - Tony was just a machine. …
☺ Consolidation:
Tony, a __h_ou_s_e_h_o_ld__ robot, was going to be _t_es_t_e_d _o_u_t__ by Claire for three weeks. Claire didn’t _a_c_ce_p_t__ until Larry promised the robot wouldn’t harm her or allow her to be h_a_r_m_e_d__. Besides, it would be a _b_o_n_us__. However, when she first saw Tony, she felt _a_la_r_m_e_d_, because he looked more like a _h_u_m_a_n__ than a _m_a_c_h_in_e_. During the three weeks, Tony changed her _a_pp_e_a_r_a_n_ce, _h_e_lp_e_d her out when in trouble, made her home more
计算机基础双语练习题
1. A handheld computer is essentially a PDA enhanced with features such as removable storage,e-mail, Web access, voice communications, built-in camera, and GPS. ______A True2.It is important to turn on all peripheral devices before you turn on the system unit. ______A True3. A screen saver will be displayed on a computer monitor after a specified period of inactivityon your computer. ______A True4.Windows allows you to select a different screen saver, but you cannot change the wait timebefore a screen saver is displayed. ______B Falseputer scientists have proposed that the term kilobyte be used to refer to 1024 bytes.______A True6.Icons on the Windows Taskbar require a double-click to start the associated program. ______B False7.Which of the following is considered a good tip to use when selecting a secure password?_________A Use a password that is eight characters or more8.To turn on a desktop computer, you need to press the _________.C Power button for the system unit and Power button for the monitor9.All of the following are peripheral devices EXCEPT a(n) _________.C System unit10.During the Windows ＂boot process＂the computer_______D All of the above11.When a computer is in ＂sleep＂mode it_______.C Conserves power by not turning off the monitor or disk drives12.Screen savers were originally designed to_______.D Prevent an image from being permanently “burned” onto the screen13.To clear a screen saver, you would_______.D Move the mouse and Press any key14.The typing keys on a computer keyboard include the ______.D All of the above15.The ______ key deletes one character to the left of the ＂insertion point＂that marks yourplace on the screen.B Backspace16.The ______ key deletes characters to the right of the ＂insertion point＂that marks yourplace on the screen.D Delete17.The ______ provides a calculator-style keypad for efficiently entering numbers.D Numeric keypad18.The ______ key captures the image on the screen and stores it in memory.A PrtSc19.Technologies used to equip devices with location awareness include ______D All of the above20.The _____ system has only two digits: 0 and 1.A binary21.The Windows desktop contains small pictures called________, which represent hardwaredevices, programs, and data files.C Icons22.By pressing the key combination _______, you can close a program that has stoppedresponding.C Ctrl, Alt, Del23.The reset button performs a(n) ________by reinitiating(重启) your Windows desktopB Hard boot（硬启动）24.Most cultures use the decimal number system because_____.A People started counting on ten fingers25.In a(n)______number system, such as the binary number system or the decimal numbersystem, the value of a digit is determined by its position in relation to other digits.C Positional26.When you add 1+1 in the binary number system, the answer is _____.C 1027.When you counting in binary, the next number after 101 is _____.B 11028.The place values for the binary number system are ______.A 32,16,8,4,2,129.Binary digits are also called ______.A Bits30.The binary digits 0 and 1 can correspond to the “on ” and “off” states of ______ when data isheld in memory.A Capacitors(电容)31.The binary 0 and 1 can correspond to the negatively and positively charged magnetic particlesthat ______.B Store data on diske paper and pencil to convert the binary number 1111000 to its decimal equivalent. Youanswer is _____.B 120e paper and pencil to convert the binary number 101010 to its decimal equivalent. Youanswer is _____.C 42e paper and pencil to convert the binary number 11101 to its decimal equivalent. Youanswer is _______.B 29D 567e paper and pencil to convert the binary number 11000111 to its decimal equivalent. Youanswer is _____.A 199e paper and pencil to convert the binary number 00001111 to its decimal equivalent. YouA 15Use paper and pencil to convert the decimal number 84 to its binary equivalent. You answer is ______.C 01010100e paper and pencil to convert the decimal number 21 to its binary equivalent. You answer is_____.C 00010101e paper and pencil to convert the decimal number 60 to its binary equivalent. You answer is_____.C 00111100e paper and pencil to convert the decimal number 137 to its binary equivalent. You answeris _____.C 10001001e paper and pencil to convert the decimal number 247 to its binary equivalent. You answeris _____.A 1111011141.______ supplies an accessory program called Calculator that can be used to convert decimalto binary and binary to decimal.C The Windows operating system42.The _____ view helps you convert binary numbers to decimal numbers and decimal numbersto binary numbers.D Scientific1.Typically, today’s microprocessors are housed in a PGA(pin grid array) chip package. ______A True2.Floppy disks are also considered hard disks because they have a “hard’ or rigid plastic case.______A True3.Peripheral devices can be added to a computer system to enhance the system’s functionality.______A True4.Pointing sticks and trackpads(触摸板) are typically supplied with notebook computers to saveyou from having to carry a mouse as an extra component. ______A True5.The term_______refers to the specifications of the components that are installed in a computersystem.D System configuration（系统配置）6.The System Information utility is able to identify a computer’s microprocessorbecause______.B A microprocessor contains a CPUID（CPU的标识符）that can be accessed by theSystem Information utility7.“Physical Memory”（物理内存）refers to _____.B RAM8.You can measure processor speed, disk access speed, 3D graphics capabilities, and more usingB Benchmark test(标准检查)9. A benchmark test can be appropriately used for all of the following EXCEPT _______.C To change the performance of a particular computer component10.If you would like an overall picture of how well your computer will run application software,you’ll get the best data by looking at the results of a(n)_______.A Application-based benchmark test11.________ tests are typically used to gauge(测量) microprocessor performance.C Synthetic12.Because microprocessor manufacturers have found ways to tailor their products to excel at theoperations measured by benchmark tests, ______.A The results of a single benchmark test may not provide an accurate picture of overallperformance13.Microprocessors work with two kinds of numbers, _______ and _______, so it is importantfor a processor benchmark to measure processing speed for both types of numbers.C Integer, floating point14.A computer creates _______ by rendering a surface over a wireframe（线框）.C Objects that appear to be three-dimensional15.A(n) _______ is one screenful of data or its equivalent storage space.B Frame16.Fast frame rates are important for displaying _______.A Smooth video and animations17.If you are interested in the speed of your computer in accessing Web pages and e-mail, youshould run ______.A A bandwidth test18.There are three types of storage technologies commonly used for personal computers_______,optical, and solid state.B Magnetic19.A personal computer display system consists of ______D A graphics card and A display device20._______ mode is a limited version of Windows that allows you to use your mouse, monitor,and keyboard, but no other peripheral devices.B Safeually all the files for downloaded software are zipped to consolidate them into one largefile. ______A True2.Presentation software assists you with composing, editing, designing, printing, andelectronically publishing document. ______B False3.It is good practice to scan downloaded filled for viruses before installing them. ______A True4._______ software is an example of utility software.B Security5.All the files needed for new software are _______ to consolidate them into one large file.6.On PCs, executable programs are stored in files with a(n) _______ extension.A .exe7.Both open source and _______ can be copied an unlimited number of times, distributed forfree, sold, and modified.B freeware1.When using Windows, you cannot use a reserved word, such as Aux, as a file name. ______A True2.Software applications, such as word processing or graphics software, do not allow you torename or delete files. ______B False3.In Windows Explorer, you can work with only one file or folder at a time. ______B False4.You can use spaces in file names. ______A True5.The earliest user interface was a command-line interface that required users to typememorized commands to run programs and accomplish tasks. ______A True6.Desktop operating systems typically are designed to accommodate a single user, but also mayprovide networking capability. ______A True7.The plus-sign icon in Windows Explorer can be used to collapse a device or folder to hidelevels of the hierarchy. ______B False8.Linux may be used as a desktop operating system. ______A True9.The main hard disk drive on a PC is usually referred to as “drive C”. ________A True10.Which of the following is responsible for allocating specific areas of memory for eachprogram running on your computer? _______B The operating system11.If you want to rename a file that you are currently editing in Microsoft Word, which is thebest command to use? _______B Save As12.Which of the following cannot be done through the “Save As” dialog box? ______D None of the above13.System Restore（系统还原）can be accessed from the Start menu by choosing _______ andthen selecting System Tools.B Accessories（附件）14.Which of the following describes an interface that uses menus and icons that you canmanipulate by pointing and clicking with a mouse? _______B A graphical user interface15.A(n) ______ operating system provides communications and routing services that allowcomputers to share data, programs, and peripheral devices.1.In a client/server network, the server is the most important resource. ____A True2.To install a Wi-Fi network, it is necessary to run wires and cables between network devices.____B False3.The main advantage of wireless networks is speed. ____B False4.Wireless networks are more secure than wired networks. ____B False5.To access shared data on other workstations, you can use My Computer to access sharedresources under the _________ folder.C. My Network Places。
人教版高中英语选修计算机英语课件 CHAPTER 7 Storage2. Floppy Disks课件
Steel band: The stepper motor usually is linked to the head rack by a coiled split steel band. The band winds and unwinds around the spindle of stepper motor translating rotary movement into linear movement.
Recording Method:
Tunnel Erasure: As the track is laid down by the R/W heads, the trailing tunnel erasure heads force the data to be present only within a specified narrow tunnel on each track. This process prevents the signals from reaching adjacent track and making cross talk.
FLOPPY DISK DRIVE
FLOPPY DISK DRIVE
Read/Write head: A floppy disk drive normally has two-read/write heads making Modern floppy disk drives as double-sided drives. A head exists for each side of disk and Both heads are used for reading and writing on the respective disk side.
计算机专业英语 -第8章
enterprise storage system : (227)A
type of system that large organizations use to promote efficient and safe use of data across the networks within their organizations. erasable optical disc (221)A CD that can be written to many times. (See also CD-RW (compact disc rewritable)) file compression (219)A hard disk performance enhancement that increases storage capacity by reducing the amount of space required to store data and programs.
head crash (216)When a hard disk’s read/write head makes contact with the hard disk’s surface or with particles on its surface resulting in a catastrophic loss of data. hi def (high definition) (222)The next generation of optical disc high-capacity disk (215)Portable storage devices that are able to store more information, and are thicker than a diskette. (see also floppy disk cartridge)
【人教版】Book 7 Unit 2 Robots reading PPT精美课件 PPT(37张)优质课件
【人教版】Book 7 Unit 2 Robots reading PPT精美课件 PPT(37张)优质课件
Para 1
Read the first paragraph and find out the reason why Tony came into Claire’s house.
It was going to be tested out by Larry’s wife, Claire.
friends. Make her house _e_le_g_a_n_t_. ___H_e_ld__ her firmly when Claire _f_e_ll_o_ff__ a
ladder. Made Claire e_n_v_i_e_d_ by Gladys and her friends.
Attractive and well-designed
• She felt her house wasn’t elegant enough.
• She wasn’t like Gladys Claffern.(Gladys
was everything she wanted to be.)
• The clerk at the counter was rude to her.
5 When he offered to help her improve her house and herself.
2 After tony arrived.
9 She remembered Tony was just a machine.
4 When he offered sympathy to her when she said she was not clever.
CHAPTER 7 Storage 3. Hard Disks课件-优质公开课-人教高中选修计算机英语精品
HARD DISKS
• Use thicker, metallic platters for storage • Faster than a floppy diskette • Large capacity • Sensitive instruments
• Partitioning: divide hard disk into separate areas called partitions; each
partition functions as if it were a separate hard disk drive.
• High-level format defines the file allocation table (FAT) for each partition,
LOW LEVEL FORMATTING
• Low level format scans disk for defects and sets aside sectors with defects so
they are not used for data.
• IDE drives should never be low level formatted by a user or technician. Only
SCSI
• Pronounced Scuzzy • Small Computer Systems Interface • For wide range of peripheral devices, including hard disks,
tape drives, optical drives, CD-ROMs and disk arrays.
人教版高中英语选修计算机英语课件 CHAPTER 7 Storage 4. CDs and DVDs课件
• • •
Nero Easy Media Creator (formally known as Easy CD Creator. NTI
15
DATAPLAY CD-R
• Optical disk • Write once format • Quarter size
sound
• 500 MB capacity • Holds 5 hours of CD-quality
file format and is used to store computer data files.
• Its specification is defined in what is called the “Yellow
Book”.
10
CD’S AND DVD’S
• CD Formats: (conti.) • CD-RW (Compact Disk Rewritable) disks, depending on how
CD-Rs technically WORMs (Write Once Read Many) are once written too and are read-only. Approximate capacity is 80 minutes of audio or 700 MB of data. CD-RWs are read writeable (or reusable) and with proper software can be used like a floppy disk. Approximate capacity is 74 minutes of audio 8 or 650 MB of data.
• Beethoven’s 5th Symphony established the capacity of the first audio
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FLOPPY DISK DRIVE
FLOPPY DISK DRIVE
Read/Write head: A floppy disk drive normally has two-read/write heads making Modern floppy disk drives as double-sided drives. A head exists for each side of disk and Both heads are used for reading and writing on the respective disk side.
Head 0 and Head 1:
Many people do not realize that the first head (head 0) is bottom one and top head is head 1. The top head is located either four or eight tracks inward from the bottom head depending upon the drive type. Head Movement: A motor called head actuator moves the head mechanism. The heads can move in and out over the surface of the disk in a straight line to position themselves over various tracks. The heads move in and out tangentially to the tracks that they record on the disk.
CLUSTERS
Clusters
DOS rarely deals with individual sectors. But instead, data storage is done in group of sectors, called sectors. Depending on the diskette type, its format, and DOS version, the cluster varies.
RECORDING FORMAT
Two types of recording formats used for storing data on the disks
1. Frequency Modulation (FM) 2. Modified Frequency Modulation (MFM)
Frequency Modulation In this method every data bit cell starts with a flux transition. A clock is recorded at the beginning data bit cell. If a data bit “1” has to be written, a flux transition is recorded in the middle of a bit cell Modified Frequency Modulation In MFM, no clock (pulse) is recorded at the beginning of a bit cell. Similar to FM, a flux transition is recorded in the middle of a bit, if the data bit to be recorded is “1”. If a data bit “0” has to be written next to a data bit “1”, then no flux transition is recorded at all. If a current and a preceding data bits are zero only one pulse is recorded at the beginning of a bit cell. From the figure it is clear that we will be able to store double the data in the same area, if we use MFM recording format instead of F.M. The recording format is decided by the operating system.
Heads are mounted on the same track, they move in unison and cannot move independently of each other.
FLOPPY DISK DRIVE
Head: The heads are made of soft ferrous (iron) compound with electromagnetic coils. Each head is a composite design with a R/W head centered within two tunnel erasure heads in the same physical assembly. PC compatible floppy disk drive spin at 300 or 360 r.p.m. The two heads are spring loaded and physically grip the disk with small pressure, this pressure does not present excessive friction.
OPPY DISK
FLOPPY DISK DRIVE
Two Types of Floppy Diskette
1. 5 1/4” Floppy Diskette (1.25MB) 2. 3 1/2” Floppy Diskette (1.44MB
FLOPPY DISK DRIVE