SCSI Devices

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Author:
jackdaniels2007
ID:
49242
Filename:
SCSI Devices
Updated:
2010-11-13 11:37:57
Tags:
SCSI CompTIA
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Description:
The specifications of SCSI devices for the A+ Certification Exam from the video.l
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  1. SCSI-1 bus width?
    8-bit
  2. SCSI-1 bus speed?
    5 MHz
  3. Major downfall of SCSI-1?
    Lack of compatibility, had to buy controller and devices from same manufacturer.
  4. SCSI-2 benefits over SCSI-1?
    Standardized connectors, bus widths, and bus speeds.
  5. SCSI-2 (Regular) bus width?
    8-bit
  6. SCSI-2 (Regular) bus speed?
    5 MHz
  7. SCSI-2 (Wide) bus width?
    16-bit
  8. SCSI-2 (Wide) bus speed?
    5 MHz
  9. SCSI-2 (Fast) bus width?
    8-bit
  10. SCSI-2 (Fast) bus speed?
    10 MHz
  11. SCSI-2 (Fast-Wide) bus width?
    16-bit
  12. SCSI-2 (Fast-Wide) bus speed?
    10 MHz
  13. Single-ended maximum length for SCSI-2 devices?
    6 meters
  14. Differential maximum length for SCSI-2 devices?
    25 meters
  15. Can single-ended and differential devices be mixed?
    No, they will smoke/burn.
  16. What is the main difference between differential and single-ended signaling?
    Differential uses 2 wires per data bit and single-ended uses 1 wire per data bit.
  17. How many devices including the controller does SCSI-1 support?
    8
  18. How many devices including the controller does SCSI-2 support?
    8
  19. How many devices does SCSI-3 support including the controller?
    Up to 16
  20. Ultra SCSI bus speed?
    20 MHz
  21. Ultra SCSI bus width?
    8-bit
  22. Ultra SCSI Single-ended maximum length?
    1.5 meters
  23. Ultra SCSI Differential maximum length?
    25 meters
  24. Wide Ultra SCSI bus speed?
    20 MHz
  25. Wide Ultra SCSI bus width?
    16-bit
  26. Wide Ultra SCSI maximum length?
    25 meters
  27. Ultra2 SCSI bus speed?
    40 MHz
  28. Ultra2 SCSI bus width?
    8-bit
  29. Ultra2 SCSI maximum length?
    25 meters
  30. Wide Ultra2 SCSI bus speed?
    40 MHz
  31. Wide Ultra2 SCSI bus width?
    16-bit
  32. Wide Ultra2 SCSI maximum length?
    25 meters
  33. Ultra3 SCSI bus speed?
    80 MHz
  34. Ultra3 SCSI bus width?
    8-bit
  35. Ultra3 SCSI maximum length?
    12 meters
  36. Wide Ultra3 SCSI bus speed?
    80 MHz
  37. Wide Ultra3 SCSI bus width?
    16-bit
  38. Wide Ultra3 SCSI maximum length?
    12 meters
  39. What does a LUN do for SCSI devices?
    Makes it so that multiple SCSI devices can use the same SCSI ID. Such as a hard drive array.

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