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APPENDIX 1
CD3000XL OperatorÕs Manual Page 291
CONNECTING AN EXTERNAL HARD DISK DRIVE
SCSI devices (hard disk drives, CD-ROMs, etc.) are connected as follows:
SCSI INTERFACE HARD DISK DRIVE
(or CD ROM, etc.)
To other SCSI devices
SCSI CABLE
The CD3000XL uses a 25-pin SCSI connector. Using a suitable SCSI cable
5
, connect the
drive(s) to the CD3000XL as shown above. Most drives have two SCSI connections and the
other can be used as a ‘thru’ to other SCSI devices such as CD ROM or another hard disk drive,
etc..
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
CD3000XL, 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.
5 Some SCSI devices use 50-way connectors. If you are using such a SCSI device, you will
need to have a 25-pin to 50-way cable or you will need to buy a 50-way to 25-pin
converter socket. Your dealer will be able to help you with this.