Sectors

Tracks

Cylinders

Sectors

Tracks

Storage: Disk Format

All magnetic disks are similarly formatted, or divided into areas, called

The formatting process sets up a method of assigning addresses to the different areas. It also sets up an area for keeping the list of addresses. Without formatting there would be no way to know what data went with what. It would be like a library where the pages were not in books, but were scattered around on the shelves and tables and floors. You'd have a hard time getting a book together. A formatting method allows you to efficiently use the space while still being able to find things.

A track is a circular ring on one side of the disk. Each track has a number. The diagram shows 3 tracks.

A disk sector is a wedge-shape piece of the disk, shown in yellow. Each sector is numbered. On a 5¼" disk there are 40 tracks with 9 sectors each. On a 3½" disk there are 80 tracks with 9 sectors each. So a 3½" disk has twice as many named places on it as a 5¼" disk.
A track sector is the area of intersection of a track and a sector, shown in yellow.

Дата добавления: 2014-12-23