Setting switch SW1

Select SCSI ID

Keys	1	2	3	SCSI ID
SW-1	OFF*	OFF*	OFF*	0
	OFF	OFF	ON	1
	OFF	ON	OFF	2
	OFF	ON	ON	3
	ON	OFF	OFF	4
	ON	OFF	ON	5
	ON	ON	OFF	6
	ON	ON	ON	7

Each SCSI device connected to the same SCSI bus must be assigned a unique SCSI ID. If contention on the bus occurs during the ARBITRATION phase, the priority of the SCSI use authority depends on SCSI IDs as follows:

7 > 6 > 5 > 4 > 3 > 2 > 1 > 0

 

SCSI bus parity check

SW-1	Key 4	ON*	Checked
		OFF	Not checked

SCAM mode

SW-1	Key 5	ON	Enabled
		OFF*	Disabled

Self Configuration Automatic Mode. Requires full support from the host adapter before being enabled.

Device type

SW-1	Key 6	ON	Optical memory device (INQUIRY reports '07')
		OFF*	Direct access device (INQUIRY reports '00')

This determines what response the drive will give to an INQUIRY command.

Spindle automatic stop mode

SW-1	Key 7	ON*	Enabled
		OFF	Disabled

With the disk loaded, the spindle continues to rotate until the START/STOP unit command instructs the spindle to stop. The spindle automatic stop function comes into operation when the host does not issue a command for about 30 minutes. If the host issues a command after the spindle has stopped then the spindle will start up and process the command without posting a not ready state. This function greatly reduces the amount of dust that can collect on the disk, however it is not suitable for a system which requires a quick response as the spindle takes several seconds to get up to speed. The access monitoring time and the function itself can be changed or enabled via a MODE SELECT command.

LED mode

SW-1	Key 8	ON	Mode 2
		OFF*	Mode 1

Mode 1
The LED lights when drive is positioning, reading, writing, loading, ejecting and during the power on test. At power-on test the LED will blink at 1 second intervals after detecting an error or 2 second intervals having detected a thermal error.

Mode 2
The LED lights only on power-on test and whilst waiting. Error detection and reporting is as for Mode 1.

Setting switch SW2

Write cache mode.

SW-2	Key 1	ON	Enabled
		OFF*	Disabled

When enabled, a write error is reported at the completion of the next command. This can speed up write times but do ensure your system will respond correctly by knowing what data to resend should an error occur.

Not used

SW-2

Key 2

Used in conjunction with SW2 Key 5

Macintosh mode

SW-2	Key 3	ON	Enabled
		OFF*	Disabled

Because of the differing ways that both Apple Macintosh and PC hosts respond to the status of the drive, set this switch accordingly. Mac mode ON will disable the 'UNIT ATTENTION' reporting on power up and media change.

Verify after write mode

SW-2	Key 4	ON	Disabled
		OFF*	Enabled

When disabled, the performance of a write operation is improved by approximately 20%, however data integrity cannot be guaranteed.

SCSI level

SCSI level	SW2 Key 5 (type 0)	SW2 Key 2 (type 1)
SCSI-1 mode	OFF*	OFF*
SCSI-2 mode	ON	OFF
Not used	OFF	ON
Not used	ON	ON

This sets the command and message type. SCSI-1 offers compatibility with previous model of optical drive, namely the M2511A (128MB model) 

SAVE DATA POINTER message mode

SW-2	Key 6	ON	No message sent before DISCONNECT message
		OFF*	SAVE DATA POINTER message posted before sending DISCONNECT message

SW-2

Key 7

OFF*

Download mode (not used)

 

SW-2

Key 8

OFF*

Used for factory examination mode only

Orientation

The drive may be installed in one of three orientations; either PCA down or on either edge. Inclination from vertical or horizontal should not exceed 10°.

Mounting Screw Fixing

Either side or underside mounting may be used. Standard drives use M3 screws but some special models and US versions use #32 UNC. Screws should not protrude from the drive frame by more than 3mm or damage may occur.

Grounding

Sufficient grounding will be provided for correct operation when the drive is screwed into an electrically grounded frame.

Cooling

The environment in which these drives are installed must comply with the requirements defined in the physical specifications. The ambient temperature is measured 3cm. from the base surface and 3cm. from the PCA surface of the drive. Considering surface temperature during operation, the contact temperature at each measurement point must not exceed the following maxima :

Measurement point	Maximum surface temperature
Inside optical cartridge	55ºC
Digital Signal Processor (DSP)	75ºC
Read Amplifier (IC)	75ºC

Air purity

Air purity in the device environment is expressed by the number of dust particles per unit area and must be Class 500 Million or less (Class 500 Million = 500 million dust particles of 0.5µm diameter or larger per cubic foot). To achieve this, a fan and filter is recommended for a general office environment. The head and disk should be cleaned every three months if the air purity is about Class 500 Million. If a filter is not used then the drive and disk will require more frequent cleaning. A double shuttered bezel is available that will protect the optics from dust and will lengthen the periods between cleaning.

External connector for CNH-2