Connecting external SCSI devices
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Appendix
Appendix
• Check the SCSI cables
Low-quality SCSI cables will almost always create problems. Always use double-
shielded cables. It is also important that the shield be grounded inside the connector.
Long SCSI cables frequently cause problems, so use as short a SCSI cable as possible.
Bending or twisting a SCSI cable in a confined space can cause conductors to break
or pins to be broken, so be careful to avoid this.
• Faulty cabling inside an external SCSI device
Inside an external SCSI drive, a V-shaped connector is normally used to connect the
two SCSI connectors and the drive. However some drives use an I-shaped connector.
Drives connected with an I-shaped connector sometimes produce noise which causes
errors.
• External SCSI devices with 25-pin connectors
Some SCSI devices use 25-pin connectors. These can also be the case of errors. Also,
most SCSI cables on which both connectors are 25-pin do not fulfill the SCSI stand-
ard, and this can also cause problems.
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