APPENDIX 1
Page 290 S3200XL Operator’s Manual - Version 1.00
NOTES ON USING HARD DISK DRIVES
SCSI CABLES
Always use high quality SCSI cables. Using cheaper SCSI cables may seem an attractive
proposition, especially if you have a tight budget but low quality cables can give rise to data
errors.
The SCSI connection requires that every connection is individually grounded. There are two
main types of SCSI cable you can buy. One is the ‘moulded’ type with moulded connectors
either end and a round cable. The other type are flat ‘ribbon’ cables. This type of cable is really
intended only for use inside devices.
Some moulded cables only have a single ground for all the connections and so can be
unreliable. They are probably fine when used with a computer for loading small documents
such as word processor files, etc., but with the large amounts of sample data used on the
S3200XL, we have had reports of them causing problems.
The flat ribbon cables, however, have individual grounding for each connection and so are
generally more reliable but, because they are intended for use inside devices (where they are
separately screened), they sometimes have insufficient screening which may cause data
noises to appear in your audio signal path when any disk activity is going on, especially if your
audio connections run parallel with the SCSI lead. However, if this is not a problem for you (and
in a studio it may not be), these cables are usually very good and usually perform much more
reliably. In a live situation, however, they are probably not ideal.
TERMINATION
A chain of SCSI devices must be terminated at either end and terminating resistors are fitted to
most SCSI devices when you buy them. The S3200XL’s SCSI interface is terminated. It is most
likely that the S3200XL will be at one end of the chain and so must be left terminated. Any
disks in between the S3200XL and the last SCSI device in the chain must be un-terminated
(this can be done by physically removing the resistors or sometimes via a DIP switch on the
back of the unit - please check the unit’s documentation). The last device in the chain must be
terminated.
S3200XL
Hard disk
MO drive
CD-ROM
Terminated
Unterminated
Unterminated
Terminated
Incorrect termination may give rise to data errors and possibly corrupted data so please ensure
it is done correctly. If you have any doubts, please contact your dealer who will be able to help.
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