| 1: | Define ATA and IDA, and explain the differences. |
| A1: | Answer: The ATA interface is the drive controller interface and the standard that defines the drive and how it operates. IDE is the actual drive and the 40-pin interface and drive controller architecture designed to implement the ATA standard. |
| 2: | What are the three major SCSI standards? |
| A2: | Answer: SCSI-1 The original SCSI standard, approved by ANSI in 1986, defined the first SCSI bus. SCSI-2 SCSI-2 was approved in 1994 as an extensive enhancement to the original standard that defined support for many advanced features. SCSI-3 SCSI-3 was approved in 1996. SCSI-3 is a group of specifications that define the implementation of SCSI protocols on different physical layers. |
| 3: | What is the main difference between a single-ended and differential SCSI interface? |
| A3: | Answer: On a single-ended interface, data travels over a single wire known as the signal line. There is a corresponding ground wire for the signal line. However, voltage is carried only on the signal line. A positive voltage is a 1, and ground voltage is a 0. Differential SCSI uses a paired plus and minus signal level to reduce the effects of noise on the SCSI bus. Each signal is carried on a twisted pair of wires. A 1 is represented by a positive voltage on one wire and an equal but opposite negative voltage on another wire. A 0 is electrical ground, or zero voltage, on both wires. |
| 4: | Which one of the following terms identifies the process in which the controller agrees on a transfer rate with each connected device during the initialization phase? Disconnect/reconnect Tagged command queuing Negotiation None of the above
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| A4: | Answer: C |
| 5: | What is the purpose of tagged command queuing? |
| A5: | Answer: Tagged command queuing (TCQ) enables a drive to receive many commands and perform those commands without involving the SCSI bus. This allows other devices to use the bus. |
| 6: | How many terminators should be on a SCSI bus and where should it/they be placed? |
| A6: | Answer: You must terminate each end of the SCSI bus. |
| 7: | What are the three new features included with Wide-Ultra3 SCSI-3? |
| A7: | Answer: Doubles the data burst of Wide-Ultra SCSI to 80MB/s, providing greater system throughput. Quadruples the maximum cable length of a Wide-Ultra SCSI-3 bus to 12m, allowing increased flexibility when adding external storage or configuring clustered servers. Maintains backward compatibility, allowing all previous SCSI implementations to be used on the same bus.
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