After studying this chapter you will be able to understand: What is the difference between drives and folders. What is the purpose of file extensions? Give two examples. What is the purpose of windows explorer? Differentiate between cut and copy? What is the purpose of Read-Only file attribute. | Interfacing with Computer ADE100- Computer Literacy Lecture 06 Knowledge test What is the difference between drives and folders. What is the purpose of file extensions? Give two examples. What is the purpose of windows explorer? Differentiate between cut and copy. What is the purpose of Read-Only file attribute. Topics covered Types of storage devices Practically knowing and accessing storage devices/drives Data transfer between different storage devices Storage devices 6B-5 Measuring & Improving Drive Performance Average access time Also known as seek time Time to find desired data Measured in milliseconds Depends on two factors RPM- Revolutions Per Minute Time to access a track Hard drive between 6 and 12 milliseconds CD between 80 and 800 milliseconds 5 Teaching tip To provide contrast, present the speed of memory as measured in the nanoseconds, or billionth of a second. Then discuss virtual RAM as defined earlier in the text. More RAM, less virtual RAM makes a faster machine. 6B-6 | Interfacing with Computer ADE100- Computer Literacy Lecture 06 Knowledge test What is the difference between drives and folders. What is the purpose of file extensions? Give two examples. What is the purpose of windows explorer? Differentiate between cut and copy. What is the purpose of Read-Only file attribute. Topics covered Types of storage devices Practically knowing and accessing storage devices/drives Data transfer between different storage devices Storage devices 6B-5 Measuring & Improving Drive Performance Average access time Also known as seek time Time to find desired data Measured in milliseconds Depends on two factors RPM- Revolutions Per Minute Time to access a track Hard drive between 6 and 12 milliseconds CD between 80 and 800 milliseconds 5 Teaching tip To provide contrast, present the speed of memory as measured in the nanoseconds, or billionth of a second. Then discuss virtual RAM as defined earlier in the text. More RAM, less virtual RAM makes a faster machine. 6B-6 Drive Performance Data transfer rate How fast data can be read Measured in Bps or bps Hard drive ranges from 15 to 160MBps CD ROMS depend on X factor 24x CD transfers 24 x 150KBps Floppy disks transfer at 45KBps 6 Insider information Most hard disks do not list the time to access a track. This is a good topic to tread lightly with. Data Transfer Rate Optimizing Performance Disk optimization (boosting) Handled by operating system tools Routine disk maintenance Optimization should be run monthly Optimizing Performance Clean up unnecessary files Delete temp files Uninstall unused programs Delete obsolete data files Files should be cleaned weekly 9 Teaching tip Figure on page 249 shows the disk cleanup utility for Windows XP. Optimizing Performance Scan a disk for errors Bad spots on the media Find and fix the error Move data to a good spot Mark the spot as bad Disks should be scanned monthly Optimizing Performance Defragment a disk Files fragment when resaved Fragmented files load .
