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CD/DVD driver can be tuned for proper operation with specific device or disabled for specific device via Registry keys. Originally these settings were introduced for compatibility with devices for those it is impossible to use auto-detection algorithm. We decided to keep list of "different" devices separately. During driver development and testing set of often deviations and corresponding tuning parameters become rather stable. For now adding of new device to the list of supported ones is usually done just via registry tuning.

You can try to tune driver yourself (for your own risk) for your recorder or disable suspicious one. You can create the hierachy of sub-keys with parameters under

HKLM\System\CurrentControlSet\Services\dwcdrw

Registry key. The most global settings are placed in

HKLM\System\CurrentControlSet\Services\dwcdrw\Parameters

More specific options can be placed under specially named sub-keys. When looking for option value driver walk through settings tree in the following order:

Parameters
Parameters\VENDOR[1] (first character)
Parameters\VENDOR[1-2] (2 leading characters)
...
Parameters\VENDOR (entire string, 8 characters)
Parameters\VENDOR\DEVICENAME[1] (first character)
Parameters\VENDOR\DEVICENAME[1-2] (2 leading characters)
...
Parameters\VENDOR\DEVICENAME (entire string, 16 characters)
Parameters\VENDOR\DEVICENAME\REVISION[1] (first character)
Parameters\VENDOR\DEVICENAME\REVISION[1-2] (2 leading characters)
...
Parameters\VENDOR\DEVICENAME\REVISION (entire string, 4 characters)

where

VENDOR is device Vendor name
DEVICENAME is device model name
REVISION is device firmware revision code

The last found value overrides all previous occurances.

Space characters (i.e. those are completing string to required length) are encoded as underscore character '_'. Underscore character itself, '#', non-printable, special, quotes and characters with codes above 127 are encoded as '#hh', where hh is hexadecimal code of the character.

If we have

Parameters\Toshiba_\DVD-RAM_SD-W
DWORD:NoStartUnitCommand=0

but

Parameters\Toshiba_\DVD-RAM_SD-W2002
DWORD:NoStartUnitCommand=1

the final value for NoStartUnitCommand option for device Toshiba, model DVD-RAM_SD-W2002 will be 0. The rest Toshiba devices with model name starting with DVD-RAM_SD-W would be 1.

• LoadMode - selective attach to specified device
• OldCdRom - disable capabilities autotetect
• NoStartUnitCommand - disable device reset with START/STOP UNIT
• NoGetConfigCommand - disable use of GET CONFIGURATION command
• DenyGetEvent - disable use of GET EVENT command
• StdCheckVerify - do not use GET EVENT command for determining disk presence
• ForceStdFormatUnit - disable use of GET EVENT command
• ModePageSize - chose MODE_SENSE modification
• ModeSelectSize - chose MODE_SELECT modification

DWORD:LoadMode (default = 1)

This value enforce operation mode for given device. Valid values:

DWORD:OldCdRom (default = 0)

This value tells driver to avoid capability probes for given device and assume it is CD-ROM. It is useful to set this value to 1 for old drives, those often hang when recieve unsupported comands. Valid values for device capability autodetection:

0x00000000 - enable
0x00000001 - disable

DWORD:NoStartUnitCommand (default = 0)

This value tells driver not to use START/STOP UNIT command for device reset. Some devices hangs after such reset attempt. The same time many other devices work better after reset.

0x00000000 - enable
0x00000001 - disable

DWORD:NoGetConfigCommand (default = 0)

This value tells driver not to use GET CONFIGURATION command. Old devices do not support it and some of them even hang. The same time this command is necessary for detecting capabilities of modern devices.

0x00000000 - enable
0x00000001 - disable

DWORD:DenyGetEvent (default = 0)

This value tells driver not to use GET EVENT command. Old devices do not support it and some of them even hang. Also, some newer devices improperly implement it. The command is used to determine media presence instead of ususal TEST UNIT READY. The practice shows, that many drives return No Media In Device status for empty CD-R or CD-RW disks when TEST UNIT READY is issued. The same time GET EVENT command gives proper result. GET EVENT is also used to detect user Eject request.

0x00000000 - enable
0x00000001 - disable

DWORD:StdCheckVerify (default = 0)

This value tells driver to use standard TEST UNIT READY command for determining disk presence.

0x00000000 - disable
0x00000001 - enable

DWORD:ForceStdFormatUnit (default = 0)

This value tells driver to use standard FORMAT UNIT command for disk formatting. Most old drives have wrong its implementation, and special workaround is to be used. Most newer drives has proper FORMAT UNIT but doesn't work with old workaround techique.

0x00000000 - disable
0x00000001 - enable

DWORD:ModePageSize (default = 6)

This value enforce usage of particular modification of ATAPI/SCSI command MODE_SENSE for given device. Valid values:

DWORD:ModeSelectSize (default = 6)

This value enforce usage of particular modification of ATAPI/SCSI command MODE_SELECT for given device. Valid values: