W-220Parts is Parts…Parts is Parts…

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Hardware

Hard Drive RAM CD-Drive Power Supply

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Hard Drive Rotational Speed

5400 RPM 7200 RPM 10,025 RPM

Data rate – number of bytes per second that the drive can deliver to the CPU. Rates usually between 5 and 40 megabytes per second

Seek time – amount of time between when the CPU requests a file and when the first byte of the file is sent to the CPU. Times between 10 and 20 milliseconds are common.

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Types of Hard Drives

Internal EIDE SCSI IEEE 1394

External SCSI IEEE 1394 USB

IEEE 1394 is the standardFireWIre is © Applei.Link is © Sony

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SCSI NameName SpecificationSpecification # of # of DevicesDevices Bus WidthBus Width Bus SpeedBus Speed MBpsMBps

AsynchronousSCSI

SCSI-1 8 8 bits 5 MHz 4 MBps

SynchronousSCSI

SCSI-1 8 8 bits 5 MHz 5 MBps

WideSCSI

SCSI-2 16 16 bits 5 MHz 10 MBps

FastSCSI

SCSI-2 8 8 bits 10 MHz 10 MBps

Fast/WideSCSI

SCSI-2 16 16 bits 10 MHz 20 MBps

UltraSCSI

SCSI-3SPI

8 8 bits 20 MHz 20 MBps

Ultra/WideSCSI

SCSI-3SPI

8 16 bits 20 MHz 40 MBps

Ultra2SCSI

SCSI-3SPI-2

8 8 bits 40 MHz 40 MBps

Ultra2/WideSCSI

SCSI-3SPI-2

16 16 bits 40 MHz 80 MBps

Ultra3SCSI

SCSI-3SPI-3

16 16 bits 40 MHz 160 MBps

http://computer.howstuffworks.com/scsi2.htm

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RAM

SIMM – single in-line memory module (72 pins)

DIMM – dual in-line memory module (168 pins)

SODIMM – small outline dual in-line memory module

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Types of RAM SDRAM

Synchronous Dynamic RAM is available in several versions, differing primarily in bus speed: PC66, PC100, and PC133.

DDR SDRAM Double-Data-Rate SDRAM (DDR SDRAM): This is an enhanced version of

SDRAM that effectively runs at double the bus speed of conventional SDRAM.

Extended Data Out (EDO), Fast Page Mode (FPM) If your PC is more than five years old, it may use EDO or FPM memory.

Although you can still find these legacy memory modules--usually priced significantly higher than most newer memory types--why bother? Chances are, such a system probably needs a lot more upgrades than just memory.

Rambus Dynamic RAM (RDRAM) developed by Rambus and championed by Intel, is the latest high-speed

memory technology. Pentium 4 PCs equipped with the Intel 850 chipset use RDRAM

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CD-Drive

Internal EIDE SCSI

External SCSI USB IEEE 1394

Especially for burners

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Power Supply

PC Item WattsAGP 20 to 30WPCI 5WSCSI card 20 to 25WFloppy Disk Drive 5WNIC 4W50X CD-ROM 10 to 25WRAM 10W per 128M5200 RPM HDD 5 to 11W7200 RPM HDD 5 to 15W550 MHz Pentium III 30W733 MHz Pentium III 23.5W

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Power Supplies…

AC input to lower DC voltages The typical voltages supplied are:

3.3 volts Digital circuits

5 volts Digital circuits

12 volts Disk drives

Power Supplies are rated by their WATT output 250 Watt 450 Watt

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Questions…