Adaptec APA-358 User Manual download pdf (Page 137)

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137

• Replace the SCSI Cable. Cables do go bad, are poorly

manufactured, and can be too long. Longer cables are

susceptible to interference.

• If the drive supports hardware compression, enable it. If the

transfer rate is still under the rating, try toggling the compression

(if ‘on’, turn it off; if ‘off’, turn it on). Some tape drives will

write data to the tape requiring more space after compression.

This can reduce the capacity of a 4/8GB tape to 3GB or less.

Data that has been compressed by the operating system can not

be compressed further by the tape drive. This will cause the tape

drive to appear to be operating at half speed and half capacity.

• Check SCSI ID assignments. Ensure that:

1. Only hard drives are at ID number zero and one;

2. Hard drives use the lowest available addresses;

3. No two devices have the same SCSI ID.

A good scheme to follow is to address hard drives starting at

SCSI ID zero and counting up, the host adapter at seven, and

other devices starting at SCSI ID six and counting down. If

you have two hard drives, one tape drive, and a CD-ROM

drive, it should be set up as:

#0 first hard drive,

#1 second hard drive,

#5 CD-ROM,

#6 tape drive,

#7 host adapter card.

• The tape drive could be failing. Try another tape drive, or

call the manufacturer of the drive.

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Adaptec APA-358 User Manual Page 137