What's SCSI?
If you have worked with Server components, you probably already know what SCSI is! It stands for Small Computer System Interface, and is used mostly with Server hard drives, especially due to its speed advantage.

Types of SCSI

• Fast SCSI  - Max 10MB/Sec
• Fast-Wide SCSI - Max 20MB/Sec
• Ultra SCSI - Max 20MB/sec
• Ultra Wide SCSI - Max 40MB/Sec
• Ultra2 SCSI - Max 40MB/Sec
• Ultra2 Wide SCSI - Max 80MB/Sec
• Ultra3 SCSI - Max 160MB/Sec
• Ultra-320 SCSI - Max 320MB/Sec
• Ultra-640 SCSI - Max 640MB/Sec
• FC-AL 1Gb - Max 1 Gbit
• FC-AL 2Gb - Max 2 Gbit
• FC-AL 4Gb - Max  4 Gbit

Note that the above are maximum speed. You might need additional software to figure out the actual speed. Many of the servers come with utilities to monitor speed of storage devices from manufacturers.

SCSI Connector Types
Not all SCSI drives have the same connectors. The pin numbers change. Here are some of the Details:

• Ultra-Wide SCSI -1 (50 Pins)
• Ultra-Wide SCSI-3 (69 Pins)
• SCA SCSI (80 Pins)

Remember, before purchasing any drive, consult the manufacturer of your system. You might have to buy a SCSI Controller first.

Hope this helps!

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