Data type


Default value


0x0–0x3FFFFFF ( bitmap )



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 Image 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.

Related Entries

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NoDriveAutoRun (in HKLM)

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NoDriveTypeAutoRun (in HKLM)

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NoDriveTypeAutoRun (in HKCU)