To disable the autorun dialog that pops up when you connect a Firewire or USB drive, 
create a new DWORD called "NoDriveTypeAutorun" (without the quotes) in the following 
registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer

Then set its value as follows:

Each hex value represents a 1 or a 0 in binary at a particular digit.  Select the 
values for the options you want and add them together (thus setting 1s and 0s accordingly).



Hex      Decimal          Meaning
0x1      1                Disables Autoplay on drives of unknown type.
0x4      4                Disables Autoplay on removable drives.
0x8      8                Disables Autoplay on fixed drives.
0x10     16               Disables Autoplay on network drives.
0x20     32               Disables Autoplay on CD-ROM drives.
0x40     64               Disables Autoplay on RAM drives.
0x80     128              Disables Autoplay on drives of unknown type.
0xFF     255              Disables Autoplay on all types of drives


So, if you want to dissable autorun for all but CD ROM insertion, add  decimal 1+4+8+16+64+128 
(skipping 32 for CD ROM), to get a total of 221 decimal or DD hex.   Enter DD in 
hex as your value for the DWORD "NoDriveTypeAutorun" you created above.  This will 
allow the installer CD ROMs you insert to still autorun, but will eliminate that 
annoying dialog that would otherwise come up when you connect a USB drive.

To dissable autorun for ALL drives including CD ROM, enter the value of 255 decimal 
or FF hex (all bits set).

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