>>I want to go one step further and actually *set* the serial number through the API. Have you ever seen that done? A software problem just jumped into my lap where the app registration was linked to the HD serial number (I hate that) and now that the HD contents were moved to a newer larger drive, the app won't run. :( I know the old serial number, so if I can just change it on this drive I'd be set...
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>Whoops, slight correction
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>SetVolumeLabel() is as close as you can come. The API provides no functionality to directly set the serial number. In order to do so, you'd have to access a of ROM BIOS interrupt call. Specifically, Int 21h Function 440Dh Minor Code 46h for FAT32. In order to do so, I think you'd have to write a virtual device driver in C.
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>Int 21h Function 440Dh Minor Code 66h returns the serial number.

I don't think he is talking about the actual hardware/firmware serial number, but the volume serial number. You can have up to 4 or more if you have that many partitions. I believe you would only need to do a low level write to the fat (or nt equivelent) of the drive to do that. Partition Magic might have the ability to do something like that in its current version. I know you used to be able to do that with norton utilities in win95 etc.