Bài giảng Computer - Chapter 09

Chapter Overview Floppy Disk DrivesHard Disk Drives 1The Basics of Floppy Disk Drives 2Keeping a Floppy Disk Drive Running Watch for exposure to environmental conditions and foreign objects.Schedule monthly cleanings.Check the floppy disk first for data errors or write protection.Check complementary metal-oxide semiconductor (CMOS) settings.Check or change the floppy disk drive cable.Change the floppy disk drive controller.Replace the floppy disk drive as needed. 3Physical Characteristics 4Storing Data 5Actuator Arms Hold read/write (R/W) heads in placeMust deliver speed and accuracyUse one of the following technologies:The stepper motor (older) had many disadvantages.The voice coil motor (newer) uses the head for mapping. Might be damaged by head-to-disk interference (HDI), or head crash 6Geometry 7Hard Disk Drive Types ST-506Enhanced Small Device Interface (ESDI)Integrated Device Electronics/Enhanced Integrated Drive Electronics (IDE/EIDE)Small Computer System Interface (SCSI) 8Installation and Setup: the Five Steps Physical installation and cablingCMOS setupLow-level formattingPartitioningHigh-level formatting 9Physical Installation and Cabling 10Setting the System CMOS for the Hard Disk Drive–CMOS Main Screen11Setting the System CMOS for the Hard Disk Drive–Hard Drive Setup Screen12Low-Level Formatting Creates and organizes sectorsSets the proper interleaveEstablishes the boot sector 13Preparing the New Drive Create a bootable disk with formatting utilities.Create a Microsoft Windows 98 startup disk.Use the bootable disk to partition and format the new drive. 14Partitioning 15High-Level Formatting FORMAT.COM does the following:Creates and configures the file allocation tables (FATs) Creates the root directory The FAT tracks which part of a file is stored on which sector.FAT32 uses disk space more efficiently. 16High-Level Formatting (Cont.) Consider several factors before using FAT32.You should not use FAT32 on dual boot systems shared by operating systems (OSs) that do not support FAT32.FAT32 partitions that are shared can be read across the network.FAT32 does not support compression.You should not use disk utilities that are not made for FAT32. 17Fragmentation and Compression A hard disk can become fragmented over time.MS-DOS, Microsoft Windows 95, Microsoft Windows 98, and Microsoft Windows Me have defragmentation programs.Disk compression eliminates wasted cluster space. 18Maintaining a Hard Disk Drive Perform comprehensive, regularly scheduled backups.Save a copy of the boot sector and partition table information.Have tools on hand for hard disk repairs.Use only disk tools certified for the hard disk drive and the OS. 19Common Errors and Troubleshooting Utilities Errors Abort, Retry, FailConnectivity problemsLost boot and partition informationCMOS errors Utilities ScandiskSCSI BIOS disk utility 20Chapter Summary Floppy disk drive technology has changed little over the years.Floppy disk drives fail more often than any other computer component.Installing a hard disk drive requires you to partition the drive, set the CMOS settings, and format the drive.The fdisk utility is used to create partitions.The geometry (CHS values) of a hard disk drive determines its storage capacity.Partition types include primary, extended, logical, and active.The active partition is used to initialize the OS. 21