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Presentation 15 – The Hard Drive

Presentation 15 – The Hard Drive. Objectives. At the end of this presentation, you will be able to:. Explain the construction and operation of a basic hard disk drive. Identify the major components inside the hard drive case.

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Presentation 15 – The Hard Drive

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  1. Presentation 15 – The Hard Drive

  2. Objectives At the end of this presentation, you will be able to:

  3. Explain the construction and operation of a basic hard disk drive. • Identify the major components inside the hard drive case. • Define track, cylinder, sector, cluster, FAT, format, and partition. • Explain the difference between low-level and high-level formatting. • Explain the purpose of FDISK and DISKPART. • Identify the connectors on a typical hard drive.

  4. Hard Drive vs. Floppy Drive

  5. Start with a non-magnetic platter. Floppy Disk - Mylar Hard Disk - Metal, Ceramic, or Glass

  6. Coat with a thin layer of magnetic material.

  7. The disk surface is divided into tracks.

  8. Track 79 Track 1 Track 0

  9. Side 1, Track 0 Side 2, Track 0

  10. Most Hard Drives Have Multiple Platters. Platter1, Track1 Platter2, Track1 Platter3, Track1 Platter4, Track1

  11. The eight track 1’s are referred to collectively as “Cylinder 1.”

  12. Read\Write Head Platter

  13. Read\Write Head Disk Read/Write Head

  14. One Sector = 512 Bytes

  15. 1 17 2 16 3 15 4 14 5 13 6 12 7 11 10 8 9

  16. 1:3 Interleave 1 12 6 7 13 17 2 11 8 5 14 16 3 10 4 9 15

  17. 1:1 Interleave 1 17 2 16 3 15 4 14 5 13 6 12 7 11 10 8 9

  18. Cluster

  19. Cluster • The smallest unit of disk space that MS-DOS could allocate to a file. • It consists of one or more sectors. • Cluster size is determined by the OS when the disk is formatted. • Generally, the larger the disk drive; the more sectors per cluster.

  20. File Allocation Table (FAT) • The OS’s road map to the disk drive. • How DOS (and early versions of Windows) kept track of which clusters belonged to which files. • How DOS kept track of bad sectors. • Two copies maintained and kept up to date by DOS. • Still accessible by most operating systems today, although the more capable NTSC (Windows NT file system) is preferred by Windows NT/2000/XP.

  21. Formatting • Low Level Formatting - Performed by the Disk Drive Manufacturer. • High Level Formatting - Performed by the PC User via the FORMAT Command.

  22. Low-Level Formatting Blank Disk Sectors and tracks defined

  23. Low Level Formatting • Performed at the factory. • Converts the single blank surface into tracks and sectors. • Finds and remaps bad spots on the disk so that the operating system can avoid them.

  24. High Level Formatting • Originally performed by the vendor of the computer. • Creates Boot Record, FAT, and the Root Directory. • Performed with the FORMAT Command.

  25. Partitioning • Makes the hard disk compatible with the operating system. • Prepares the hard disk for high-level format. • Divides the hard disk into two or more partitions or makes it all one large partition. • Performed with the FDISK or DISKPART command.

  26. The Hard Drive Case Should Not be opened.

  27. Typical Hard Drive Connectors 8-pin Jumper Connector 40-pin IDE Cable Connector 4-pin Power Connector

  28. End

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