This value is comprised 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 autorun feature is enabled on that drive. If a bit is set to 1, the autorun feature is disabled on that drive. 

For example, if the value of this entry is 0x8 (1000 binary), autorun is disabled on drive D. Note that a value of 1 in the bit representing the CD-ROM drive takes precedence over the value of Autorun. 

Key:[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
Value Name: NoDriveAutoRun
Data Type: REG_DWORD

 

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