Computer Hardware Technician: System Case

Computer Hardware Technician Module-1.1

System Case By

S.Lankeswaran, BSc in Computer Science SHANMUGHA Computers Kovilputhukulam, Vavuniya, Sri Lanka. 0094-24-4922690 By. S.Lankeswaran, BSc. in Computer Science,

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In this Chapter we will learn: • • • • • •

Parts of the system case Styles and sizes Form factor Case switches Case LEDs Drive bays

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Parts of the system case Frame & Cover

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Styles and sizes 1.Full Tower Case 2.Mid Tower Case 3."Midi" Tower Case 4.Mini Tower Case 5.Slim line Case 6.Desktop Model

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Styles and sizes …(Comparison of Case Styles) Case Style

Size

External Bays

Internal Bays

Cooling

Power Supply

Cost

Full Tower

Large

2 + 4 or more

3 to 5 or more

Best

250 to 375 +

High

Mid Tower

Med

2+3

2 to 4

Better

200 to 300

Med

"Midi" Tower

Small to Med

2 + 2 or 2+3

2 to 4

Good

170 to 300

Low to Med

Mini Tower

Small

2+2

2 or 3

Good

170 to 250

Low

Desktop

Small

2+2

1 or 2

OK

150 to 230

Low

Slimline

Very Small

1+2

1 or 2

Worse

90 to 200

Low

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Form Formfactor factor

•

The form factor describes the general layout of the case, – – –

the positioning of the slots in the back of the case, the way that the case matches to the major components that fit into it. In particular, there are three main components that must be matched in terms of their form factor:

1. The Case, 2. The Power Supply, 3. The Motherboard. By. S.Lankeswaran, BSc. in Computer Science,

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Form factor… The most popular case form factors today are 1. “Baby AT“ 2. “ATX” 3. “NLX” (Baby AT systems are now out of date but there are so many millions of them in use that they remain a factor, especially in the upgrade and repair market.) These cases are not interchangeable, since they are shaped differently, and require motherboards with a different form factor. If you are building your own system you must ensure your motherboard and case/power supply form factors match. By. S.Lankeswaran, BSc. in Computer Science,

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Form factor…

Baby AT

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NLX Shanmugha Computers

Form factor…

WTX By. S.Lankeswaran, BSc. in Computer Science,

LPX 9

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Case switches

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Case LEDs Power LED •The power LED is usually green. •it comes on when the power is on. Hard Disk Drive Activity LED •The most important indicator on the case, this LED normally flickers on when the hard disk is being accessed. •It is important in that it gives you a visual indication of how active your system is, and can help ensure that you don't shut off your system while the hard disk is active (which you should never do). By. S.Lankeswaran, BSc. in Computer Science,

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Drive bays Drive bays are the spaces in the system case where you mount your hard disk, floppy, CD-ROM, tape and other drives. They come in two general types, external and internal, and two sizes: 5.25" and 3.5".

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Drive bays… (External) These drive bays are certainly inside the case. However, they are called "external" because they allow access to the device from the outside.

Any drive that uses removable media or has controls that must be operated manually must go in an external drive bay. This includes floppy disk, CDROM, DVD, tape and removable-storage drives. By. S.Lankeswaran, BSc. in Computer Science,

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Drive bays… (Internal)

These bays entirely within case and are accessible from outside.

are the not the

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Drive bays… (Drive Rails and Brackets)

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Drive Bays… (Sizes: 3.5" and 5.25“) Drive Bay Size

Width (in)

Depth (in)

3.5"

4.00

5.75

1.00

5.25"

5.75

8.0

1.63

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Height (in)

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Connection method in Caseing

Casing Types Casing Pictures

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