3.4 Connection Requirement
3.4.4 External operator panel settings (CNH2)
(1) Device type mode
Table 3.5 shows the device type settings which are returned when the INQUIRY command is issued to the optical disk drive.
Table 3.5 Device type mode setting
Device Type | CNH 2/Pin 9 | - GND |
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X'07' (Optical memory device) | Short |
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X'00' (Direct access device) | Open * | |
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* Setting when shipped
(2) Verify mode
The default setting of the verify function is specified. When the verify mode is invalid, verification is not performed when the WRITE command is issued. With the verification invalid, the writing speed is increased by about 20% (depending on the situation). Table 3.6 shows the verify mode settings. The verification can also be specified as valid or invalid by the MODE SELECT command.
Table 3.6 Write verify mode setting
Write verify mode |
| CNH 2/Pin 11 - GND | |||
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Does not perform verification for the WRITE |
| Short | |||
command (invalid) |
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Performs verification for the WRITE command |
| Open* | |||
(valid). |
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* Setting when shipped |
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Data loss: When the verify function is invalid, the write data quality is not guaranteed. This mode should not be used for storing important data. When using the mode for storing important data, a preventive system measure such as file duplication is required.
