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Video Summary

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Submitted By monicawagner2008
Words 1002
Pages 5
Unit 6 Assignment 1
Video Summary 4
2/14/2014
Monica Wagner (17887806) |

* Hard Drive * Hard drive comprised of platters * Read/write heads for each platter * Read and write on top and bottom of platter * Never expose to magnet * Data loss my result * 137GB Limit * Hard drive size limited to 137GB * Not a physical limit * Limited by addresses system can support * 28-bit communications * Limit to 268,435,555 addresses * Equates to 137GB * Flash Bios to upgrade * Hard Drive Interfaces * PATA, SATA, SCSI, USB, and Fire wire * Most common is PATA inter faces * Sometimes referred to as IDE or EIDE * IDE describes drive standard * Not the connector * Refers to hard drives, CD drive, DVD drives and tape drives * Now used inter changeably with PATA * PATA- Parallel ATA * IDE (PATA) cable has two connections * Master and Slave * Motherboard supports two cables * Primary and secondary * Four devices total * Primary master and primary slave * Secondary master and secondary slave * Motherboard Connectors * Blue=primary channel * Black=secondary channel * Cable connectors * Blue=plugs to motherboard * Black=first device * Gray=second device * Master/Slave designation * Not determined by position on cable * Determined by jumpers on drive * Check documentation or labels * Master, slave, cable select * Best-hard drive installation * Master on primary * Only device on cable * Other IDE devices on secondary cable * CD/DVD * 2nd hard drive * This improve performance * PATA cables * 40 pins and 40 wires * 40 pins and 80 wires * Extra wires= ground * 40 pin connector * 18 Inch maximum length * ATA 100=100Mbps * ATA 133=133Mbps * Serial ATA * Serial ATA connector * Smaller than PATA * Faster than PATA * More expensive * One drive per Cable * If motherboard supports SATA * Two (or more) SATA and two PATA * Total six devices connected * Floppy Drives * Largely replaced by * Flash drives * Cd drives * DVD drives * 3 ½ ‘’ Disk- 1.44MB data * Earlier 5 ¼ ‘’ disk * Each disk must be for matted * Creates tracks and sectors * Creates files allocation table * Preformatted now * Early disks formatted by user * Power Supply Connections * Connection type * Molex * Larger * Hard drives CD drive, and DVD drive * Berg * Smaller * Floppy drives * Can be connected upside down * Floppy Drive * 34 pin cable * Furthest from twist – motherboard * After twist- A * After twist- B * 3 ½ & 5 ¼ drives * Red stripe indicates pin 1 * Orients cable for correct installation * CDS * Pits and lands * Represent bits – 0 and 1 * Continuous spiral * Read by laser * Optical reader * Three type * CD- Rom= Red only * CD-R= Recordable * CD- RW= Re-writable * DVDS * Shorter wave length laser * Data more Closely Spaced * More data Per Disk * Write second layer * Write to both sides of disks * Increased Capacity * Multiple layers increases capacity * Single sided/ single layer> 4.7 GB * Single sided / double layer> 8.5GB * Double sided / single layer>9.4GB * Double Sided/ Doubled layer>17GB * HD-DVD> 30GB * Blu-ray>50GB * CDs and DVDs * Power supply * Molex connector * Motherboard * IDE (PATA) cable * Two cables per motherboard * Two devices per cable * Best arrangement * Hard drive on primary channel * Other devices share secondary channel * Care and handling * Pick up at edge * Avoid scratches * Avoid finger prints * Wipe with soft cloth * Wipe from center to edge * SCSI Devices * Small computer system Interface * Faster * More expensive * Complex configuration * Three SCSI standards * SCSI-1 (regular SCSI) * SCSI-2 (fast SCSI) * SCSI-3 (Ultra SCSI) * SCSI connectors * Narrow SCSI * Wide SCSI * SCSI 1 * 50-pin, 8-bit A-Type (narrow connector ) * Supports 8 devices (including host ) * SCSI 2 * 68-pin, 16-bit P-Type (wide) connector * Supports 16 devices (including host) * SCSI3 * Supports serial and parallel communication * Supports 8, 16, and 32-bit data bus * Supports 32 devices (including host) * Internal or external * External have two connectors * May be daisy chained * Both end of chain must be terminated * SCSI * SCSI ID * Each SCSI device requires ID * Host adapter Requires ID * ID identifies device * ID dose not priority * IEEE 1394- Fire wire * Expected to replaced SCSI * Faster * Easier to configure * IEEE 1394 * Fire Wire and link * Commercial products * Use IEEE 1394 technology * Serial communications * Isochronous Data transmission * No synchronization with clock and processor * Useful for streaming video * IEEE 1394 * 400Mbps * Cable 4.5M * 16 devices * Fire Wire 400 * IEE 1394 * 3.2Gbps * Cable 100M * 63 devices * Fire wire 800 * Solid State Removable * Many different type * Compact flash used in PC card slot * Flash (thumb, jump) drive with USB port * Vault drive with USB port * More capacity * Faster * All are solid state drives * Not magnetic or optical * Becoming cheaper/ higher capacity * Tape Drives * Inexpensive and convenient * Data back up * Internal and external models * Use PATA (IDE), SATA, SCSI, or USB * Uses sequential access * Must read from beginning to end * Data access slow * SRAM VS DRAM * SRM * Faster * More expensive * Dose no need refreshing * Cache memory for CPU * DRAM * Dynamic RAM * Used for computer memory * Types of DRAM * SIMM
DIMM
* RIMM * SIMM * Used in order computers * 32 bit data path * 30-pin and 72-pin versions * 72-pin SIM * Single notch offset from center * 30-pin SIMM * Smaller * No notch * DRAM * DIMM * 64-bit data path * Synchronized to system clock * SDRAM – synchronous Dynamic RAM * DDR SDRAM (double data rate) * DDR2 SDRAM (double data rate 2) * Original SDRAM * 168 pins * One notch for alignment * Two times faster than SDRAM * DDR2 SDRAM * 240 Pins * One notch for alignment * Four times faster than SDRAM * Dual Channeling * DDR and DDR2 SDRAM * Dual channeling technology * Two slots process information together * Memory slots must be balanced * Both filled with same size RAM modules * Example * Computer with 3GB RAM * Four DIMM slots * Two 1GB Modules * Two 512 MB Modules * May Upgrade both 512 modules * May remove both 512 Modules * RIMM * Rambus or RDRAM * Similar in appearance to DIMM * Two notches in center of module * Faster but replace SDRAM * DDR and DDR2 dominate today’s market * All memory slots filled * With memory modules * Or Continuity CC-RIMM module * Memory Errors * Parity Bit * Check integrity of each byte * Determine if byte is good or bad * Cannot determine which bit is bad * Cannot repair * ECC * Can check bits * Can repair bits

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