Hard disk hd hdd drives cylinder geometry physical circuitry structure permanent secondary storage tracks cylinder sector head platters

A cylinder is basically the set of all tracks that all the heads are currently located at. If a disk has four platters, in general case it would have eight heads. Now suppose it has cylinders number 720.

Hard disk drives cylinder physical circuitry geometry structure

It would be made up of the eight set of tracks, one per platter surface with tracks number 720. The name comes from the fact that these tracks form a skeletal cylinder because they are equal-sized circles stacked one on top of the other in space, as shown in the figure given before.

The addressing of the factors of the disk is traditionally done by referring to cylinders, heads and sectors (CHS).

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Data Recovery Book

Chapter 1	An Overview of Data Recovery
Chapter 2	Introduction of Hard Disks
Chapter 3	Logical Approach to Disks and OS
Chapter 4	Number Systems
Chapter 5	Introduction of C Programming
Chapter 6	Introduction to Computer Basics
Chapter 7	Necessary DOS Commands
Chapter 8	Disk-BIOS Functions and Interrupts Handling With C
Chapter 9	Handling Large Hard Disks
Chapter 10	Data Recovery From Corrupted Floppy
Chapter 11	Making Backups
Chapter 12	Reading and Modifying MBR with Programming
Chapter 13	Reading and Modifying DBR with Programming
Chapter 14	Programming for “Raw File” Recovery
Chapter 15	Programming for Data Wipers
Chapter 16	Developing more Utilities for Disks
Appendix	Glossary of Data Recovery Terms