Team 4Project 2 Presentation

Flat Panel Displays, Serial ATA, & SCSI

Tom, Jen, Curtis, Ashley, Scott

Flat Panel Display Types

Liquid Crystal Display (LCD) Static

Advantages:

Compact and Light

Lower power consumption

Not affected by screen burn in

Disadvantages:

Limited viewing angle

Bleeding or uneven backlighting

One native resolution

Dead or stuck pixels

Flat Panel Display Types

Plasma Volatile

Advantages:

Picture quality

Less visible motion blur

Higher refresh rates and faster response times

Disadvantages:

Screen burn in

Uses more electricity than LCD

Do not work at high altitudes

What is SCSI?

SCSI is a set of standards for physically connecting and transferring data between computers and peripheral devices.

Originally stood for Small Computer System Interface

SCSI goes back to 1979

A SCSI Host can control up to either 8 or 16 devices

SCSI TYPES

•SCSI-1: The original specification developed in 1986, SCSI-1 is now obsolete. It featured a bus width of 8 bits and clock speed of 5 MHz.

•SCSI-2: Became the standard in 1994 Included the Common Command Set (CCS) -- 18 commands considered an

absolute necessity for support of any SCSI device.

Double the clock speed to 10 MHz (Fast),

Double the bus width from to 16 bits and increase the number of devices to 15 (Wide),

or double both (Fast/Wide).

SCSI-2 also added command queuing, allowing devices to store and prioritize commands from the host computer.

•SCSI-3: showed up in 1995 and included a series of smaller standards within its overall scope.

Most SCSI-3 specifications begin with the term Ultra, such as Ultra for SPI variations, Ultra2 for SPI-2 variations and Ultra3 for SPI-3 variations.

SCSI-3 is the standard currently in use.

SCSI Advantages

Can support up to 7 drives on a narrow bus or 15 on wide bus inside or outside the box

SCSI allows for queuing to each device

SCSI uses 5% of CPU whereas IDE uses 95%

What is Serial ATA?

Serial ATA (Serial Advanced Technology Attachment)

New interface for high volume storage drives and disks

Communicates using a single high-speed 7 wire serial cable

SATA Advantages

Physically smaller and more efficient

Faster than previous generations

Less cables

Doesn’t use jumpers (no master/slave)

Point to point topology

Possible Failures

Hard drives (SCSI & SATA) Failures Defective drives

Mechanical

Motor

Spindles

Read write heads

Power cables are not seated properly

Out-of-Date BIOS

Possible Failures

SCSI: LUN (address)

Termination

Flat Panel Displays: Dead pixels

Striping

Poor quality

Blank screen

Questions?

T/F - LCD stands for Light Crystal Display.

T/F - SCSI stands for Small Computer System Interface.

Name a disadvantage of LCD.

What percentage of the CPU does SCSI use?

Which flat panel device does not work at high altitudes?