Akai CD3000XL Instrukcja Operatora Pobierz pdf (Strona 285)

APPENDIX 1

S3000XL Operator’s Manual Page 279

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 S3000XL uses a 25-pin SCSI connector. Using a suitable SCSI cable

, connect the

drive(s) to the S3000XL 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 S3000XL, 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 S3000XL’s SCSI interface is

terminated. It is most likely that the S3000XL will be at one end of the chain and so must

be left terminated. Any disks in between the S3000XL 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.

3 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.

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