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MotherboardMotherboard4. Take note of the chipset model when
you purchase new motherboard.
5. New motherboard are jumperless.
6. Some motherboard have onboard
WiFi tx/rx.
7. Get to know the BIOS
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Motherboard LayoutMotherboard Layout
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Motherboard Layout (rear panel)Motherboard Layout (rear panel)
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MemoryMemory1. When buying RAM take note of the
size and the speed.
2. Extended memory is all memory afterthe first 1MB of RAM.
3. Memory latency is the amount of time
it take to locate the data stored.
4. DDR have 240 pins, the diff. between
DDR2 and DDR3 is the speed
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Memory installationMemory installation
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Memory installationMemory installation
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HardiskHardisk1. Hardisk is organized in terms of
tracks, sectors, and cylinders. 1
sector is equal to 512 bytes
2. Byte is the unit of measurement to
measure the capacity to store data
3. 1K = 1,024 bytes1M = 1,048,576 bytes
4. Disk Platter where data is stored is
made of aluminum and glass ceramic
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HardiskHardisk5. The speed in reading data depends
in revolution per minute of the spindle
motor.
6. It uses Read / Write head that are
constructed with a magnetic core
7. Recording of information to thehardisk uses Magnetic Flux
8. Connection to the motherboard uses
IDE or SATA. Either master or slave
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Hardisk PartsHardisk Parts
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Hardisk PartsHardisk Parts IDE CableIDE Cable
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Optical DriveOptical Drive1. CD capacity is 650 MB DVD
capacity is 4GB.
2. Optical drive uses LASER to storeand retrieve information.
3. The interface of optical drive is the
same interface cable used byhardisk.
4. It uses single spiral track to store
information.
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Optical DriveOptical Drive
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Video CardVideo Card1. Uses AGP or PCI express in the
motherboard.
2. Uses SVGA that supports 16 millioncolors. Screen resoultion is the size
of the screen 1024 x 768
3. New video card have GB videomemory
4. Refresh rate is the number of flicker
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Video CardVideo Card
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Power SupplyPower Supply1. Power supply converts AC to DC
2. Capacity is measured in terms of
Watts.
3. Voltage needed by motherboard is
3.3V, 5V, and 12V.
4. Power supply does not protect the
circuitry from voltage fluctuation.
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Power SupplyPower Supply
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Magnetic Disks
p. 357 Fig. 7-5 Next
What are tracksand sectors?
Track
is narrow
recording band
that forms full
circle on disk
Sector
stores upto
512bytes
of data
Formattingprepares disk for use and marks bad sectors as unusable
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Magnetic Disks
What is a cylinder?
p. 362 Fig. 7-13 Next
Vertical sectionof trackthrough allplatters
Singlemovement ofread/writehead armsaccesses all
plattersin cylinder
platter
read/writehead
platter
sides
cylinder
tracksector
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Magnetic Disks
How do you compute a disks storagecapacity?
p. 359 Next
Multiply number of sides, number of tracks, numberof sectors per track, and number of bytes per sector
For high-density disk: 2 sides v 80 tracks v 18 sectors pertrack v 512 bytes per sector = 1,474,560 bytes
Characteristics of a
3.5-inch High-Density
Floppy Disk
Capacity: 1.44 MB
Sides: 2
Tracks: 80
Sectors per track: 18
Bytes per sector: 512
Sectors per disk: 2880
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Magnetic Disks What is a head crash?
p. 362 Fig. 7-14 Next
clearance
read/write head
platter
hair
dustsmoke
Spinning creates cushion of air that floats read/writehead above platter
Occurs when read/write head touches platter surface
A smoke particle, dust particle, or human hair
could render drive unusable
Clearance between head and platter is approximatelytwo-millionths of an inch