1. W-220 Parts is Parts…

2. September 8, 2003Riad S. Twal2 Hardware Hard Drive RAM CD-Drive Power Supply

3. September 8, 2003Riad S. Twal3 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.

4. September 8, 2003Riad S. Twal4 Types of Hard Drives Internal EIDE SCSI IEEE 1394 External SCSI IEEE 1394 USB IEEE 1394 is the standard FireWIre is © Apple i.Link is © Sony

5. September 8, 2003Riad S. Twal5 SCSI NameSpecification # of Devices Bus Width Bus Speed MBps Asynchronous SCSI SCSI-188 bits5 MHz4 MBps Synchronous SCSI SCSI-188 bits5 MHz5 MBps Wide SCSI SCSI-21616 bits5 MHz10 MBps Fast SCSI SCSI-288 bits10 MHz10 MBps Fast/Wide SCSI SCSI-21616 bits10 MHz20 MBps Ultra SCSI SCSI-3 SPI 88 bits20 MHz20 MBps Ultra/Wide SCSI SCSI-3 SPI 816 bits20 MHz40 MBps Ultra2 SCSI SCSI-3 SPI-2 88 bits40 MHz40 MBps Ultra2/Wide SCSI SCSI-3 SPI-2 1616 bits40 MHz80 MBps Ultra3 SCSI SCSI-3 SPI-3 1616 bits40 MHz160 MBps http://computer.howstuffworks.com/scsi2.htm

6. September 8, 2003Riad S. Twal6 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

7. September 8, 2003Riad S. Twal7 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

8. September 8, 2003Riad S. Twal8 CD-Drive Internal EIDE SCSI External SCSI USB IEEE 1394 Especially for burners

9. September 8, 2003Riad S. Twal9 Power Supply PC ItemWatts AGP20 to 30W PCI5W SCSI card20 to 25W Floppy Disk Drive5W NIC4W 50X CD-ROM 10 to 25W RAM10W per 128M 5200 RPM HDD5 to 11W 7200 RPM HDD5 to 15W 550 MHz Pentium III30W 733 MHz Pentium III23.5W

10. September 8, 2003Riad S. Twal10 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

11. September 8, 2003Riad S. Twal11 Questions…