Team 4 Project 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) 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(SCSI & SATA) Failures Defective drives Mechanical Motor Spindles Read write heads Power cables are not seated properly Out-of-Date BIOS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?