The density of the disk surface refers to the amount of data that can be stored in a given amount of space. In other words, the higher the density, the tighter it can pack the data together on a floppy disk. There are two basic factors:
How many tracks can be fit on the disk ( track density )
-measured in tracks per inch or TPI
How many bits can be fit on each track ( bit density ).
Basically, a hard disk consists of flat disks called platters , coated on both sides with a special magnetic media material designed to store data.
The platters are mounted by cutting a hole in the center and stacking them onto a spindle .
The platters rotate at high speed, driven by a special spindle motor connected to the spindle. Special electromagnetic R/W devices called
R/W heads are mounted onto sliders and used to either record data onto the disk or read data from it. The sliders are mounted onto arms , all of which are mechanically connected into a single assembly and positioned over the surface of the disk by a device called an actuator .
Before setting up the operating system on the computer, it is important that the BIOS settings are set correctly. To enter the BIOS, follow the instructions on the POST screen.
STEP 1 On the POST (Power-on Self Test) screen shown in Figure 7- 35, it says “Press Del to enter Setup”. Other computers may ask you to hit Ctrl+Alt+Esc, or hit F1. Press the button “ Delete” on the keyboard.