Relevante Registry Einträge Windows 2000
(1) AutoRunAlwaysDisable
<HKLM\SYSTEM\CurrentControlSet\Services\Cdrom>
(Suppresses the Media Change Notification (MCN) message for particular CD-ROM drives.)
This entry identifies devices that do not support media features. Typically, this list consists of CD-ROM changers that do not support Autoplay because they must load the media physically to verify that it is a compact disc before playing.
The entries in this list need not be complete device identifiers. The system suppresses the MCN message for all devices that begin with the characters of an entry in the list. This method makes it easier to disable media features for all products of a certain vendor or product line.
Note
If the value of this entry is not blank, it takes precedence over a value of_1 in AutoRun for the particular devices identified.
If a device is identified in this list, Autoplay does not operate on the device, regardless of the value of the NoDriveAutoRun entry (in HKLM and HKCU) and the NoDriveTypeAutoRun entry (in HKLM and HKCU).
The identifiers listed in this value are those reported to the system by the device. These identifiers might differ from those listed on the drive housing.
The default value for this entry consists of products and product groups that have been identified through testing as being unable to support Autoplay. This list might change as testing progresses and products are updated.
Tip
To disable Autoplay on particular drives, use the NoDriveAutoRun entry (HKLM or HKCU) or the NoDriveTypeAutoRun entry (HKLM or HKCU). Do not disable the MCN message unless you have no alternative.
(2) Autorun
<HKLM\SYSTEM\CurrentControlSet\Services\Cdrom>
(Determines whether the system sends a Media Change Notification (MCN) message to the Windows interface when it detects that a CD-ROM is inserted in the drive. The MCN message triggers media-related features, such as Autoplay.
If the MCN message is disabled, the media features that use it do not operate.)
Change method
To change the value of this entry, use Device Manager.
Activation method
To make a change to this entry effective, you must restart Windows_2000.
Note
If the value of this entry is_0, Autoplay does not operate, regardless of the value of the NoDriveAutoRun entry (in HKLM and HKCU) and the NoDriveTypeAutoRun entry (in HKLM and HKCU).
Tip
To disable Autoplay on particular drives, use NoDriveAutoRun (in HKLM or HKCU) or NoDriveTypeAutoRun (in HKLM or HKCU). Do not disable the Media Change Notification message unless you have no alternative.
(3) NoDriveAutoRun (in HKLM)
<HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer>
(Determines whether the Autoplay feature is enabled on each drive connected to the system. When Autoplay is enabled, media starts automatically when it is inserted in the drive.
The value of this entry consists of 32 bits. The lower 26 bits each represent a drive, with the lowest (right-most) bit representing drive A, and the 26th bit from the right representing drive Z. If a bit is set to 0, the Autoplay feature is enabled on that drive. If a bit is set to 1, the Autoplay feature is disabled on that drive.)
Note
A Media Change Notification (MCN) message from the CD-ROM driver triggers Autoplay. If the Windows interface does not receive this message, Autoplay does not operate, regardless of the value of this entry. Entries that suppress the MCN message, such as Autorun and AutorunAlwaysDisable, also disable Autoplay.
Autoplay is also disabled on any drive if it is disabled by the value of NoDriveAutoRun (in HKLM or HKCU) or NoDriveTypeAutoRun (in HKLM or HKCU). But if either of these entries appear in HKEY_LOCAL_MACHINE, the corresponding entries in HKEY_CURRENT_USER are ignored.
Although this entry is located in the Policies\Explorer subkey, it is not associated with a Group Policy included in Windows 2000.
Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.
Tip
For detailed information about particular Group Policy settings, see the Windows 2000 Resource Kit Group Policy Reference.
For general information about Group Policy, see Windows 2000 Server Help or Windows 2000 Professional Help.
(4) NoDriveAutoRun (in HKCU)
<HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer>
(Determines whether Autoplay is enabled on each drive connected to the system. When Autoplay is enabled, media starts automatically when it is inserted in the drive.
The value of this entry consists of 32 bits. The lower 26 bits each represent a drive, with the lowest (right-most) bit representing drive A, and the 26th bit from the right representing drive Z. If a bit is set to 0, the Autoplay feature is enabled on that drive. If a bit is set to 1, the Autoplay feature is disabled on that drive.
For example, if the value of this entry is 0x8 (1000 binary), Autoplay is disabled on drive D.)
Note
Autoplay is triggered by a Media Change Notification (MCN) message from the CD-ROM driver. If the Windows 2000 interface does not receive this message, Autoplay does not operate, regardless of the value of this entry. Entries that suppress the MCN message, such as Autorun and AutoRunAlwaysDisable, also disable Autoplay.
Autoplay is also disabled on any drive if it is disabled by the value of NoDriveAutoRun (in HKLM or HKCU) or NoDriveTypeAutoRun (in HKLM or HKCU). However, if NoDriveAutoRun or NoDriveTypeAutoRun appear in HKEY_LOCAL_MACHINE, the corresponding entries in HKEY_CURRENT_USER are ignored.
Although this entry is located in the Policies\Explorer subkey, it is not associated with a Group Policy setting in Windows 2000.
Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.
(5) NoDriveTypeAutoRun (in HKLM)
<HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer>
(Disables the Autoplay feature on all drives of the type specified.
Autoplay begins reading from a drive as soon as media is inserted in the drive. As a result, the setup file of programs and the sound on audio media starts immediately.
This entry stores the setting of the Disable Autoplay Group Policy. Group Policy adds this entry to the registry when you enable the Disable Autoplay policy. If you disable the policy or set it to Not configured, Group Policy deletes this entry from the registry, and the system behaves as though the value is 0x95.
This entry is a bitmapped value. To disable Autoplay on a particular type of drive, set the bit representing that drive type to 1. To disable more than one type of drive, set the bits representing each type to 1, or sum the hexadecimal values of the representative bits.)
By default, Autoplay is disabled on removable drives, such as the floppy disk drive (but not the CD-ROM drive), and on network drives. The default value 0x95 (149) is the sum of 0x1, 0x81 (unknown types), 0x4 (floppy drives), and 0x10 (network drives).
Note
A Media Change Notification (MCN) message from the CD-ROM drive triggers Autoplay. If the Windows interface does not receive this message, Autoplay does not operate, regardless of the value of this entry. Entries that suppress the MCN message, such as Autorun and AutoRunAlwaysDisable also disable Autoplay.
Autoplay is also disabled on any drive if it is disabled by the value of NoDriveAutoRun (in HKLM or HKCU) or NoDriveTypeAutoRun (in HKLM or HKCU). But if NoDriveAutoRun or NoDriveTypeAutoRun appear in HKEY_LOCAL_MACHINE, the corresponding entries in HKEY_CURRENT_USER are ignored.
You can use the Disable Autoplay Group Policy to add CD-ROM drives to the list of drive types already disabled (removable drives, network drives, and unknown drives) or to disable Autoplay on all drives. You must edit the registry to set any other value.
(6) NoDriveTypeAutoRun (in HKCU)
<HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer>
(Disables the Autoplay feature on all drives of the type specified.
Autoplay begins reading from a drive as soon as media is inserted in the drive. As a result, the setup file of a program or the sound on audio media starts immediately.
This entry stores the setting of the Disable Autoplay Group Policy. Group Policy adds this entry to the registry when you enable the policy. If you disable the policy or set it to Not configured, Group Policy deletes this entry from the registry, and the system behaves as though the value is 0x95.
This entry is a bitmapped value. To disable Autoplay on a particular type of drive, set the bit representing that type of drive to 1. To disable more than one type of drive, either set the bits representing each type to 1 or sum the hexadecimal values of the representative bits.
By default, Autoplay is disabled on network drives and on removable drives, such as the floppy disk drive (but not the CD-ROM drive). The default value 0x95 (149) is the sum of 0x1 (unknown types), 0x81 (unknown types), 0x4 (floppy drives), and 0x10 (network drives). )
Change method
To change the value of this entry, use Group Policy. This entry corresponds to the Disable Autoplay Group Policy (User Configuration\Administrative Templates\System).
Note
Autoplay is triggered by a Media Change Notification (MCN) message from the CD-ROM driver. If the Windows 2000 interface does not receive this message, Autoplay does not operate, regardless of the value of this entry. Entries that suppress the MCN message, such as Autorun and AutorunAlwaysDisable also disable Autoplay.
Autoplay is disabled on any drive if the value of NoDriveAutoRun (in HKLM or HKCU) or NoDriveTypeAutoRun (in HKLM or HKCU) is set to disable it. But if NoDriveAutoRun or NoDriveTypeAutoRun appear in HKEY_LOCAL_MACHINE, the corresponding entries in HKEY_CURRENT_USER are ignored.
You can use the Disable Autoplay Group Policy to add CD-ROM drives to the list of drive types already disabled (removable drives, network drives, and unknown drives) or to disable Autoplay on all drives. You must edit the registry to set any other value.
Tip
For detailed information about particular Group Policy settings, see the Windows 2000 Resource Kit Group Policy Reference.
For general information about Group Policy, see Windows 2000 Server Help or Windows 2000 Professional Help.
To see a table associating policies with their corresponding registry entries, see the Group Policy Registry Table.
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