Identify a cd-rom (is there a SID in a cd ?)

[FireJocker]

Hi,

I need to create an application which will be writted on many CD-ROM (10.000 cd), each cd is same as other, there isn't any possibility to write a different file on each cd,

But I need to authenticate each cd without needing a manual entry (serial number...) by user.

So, I'm looking if it exist a SID on each CD, like the MAC address for network card and how getting it in C++.

Thanks all.

[philkr]

Check out the fourth parameter: GetVolumeInformation()

[FireJocker]

and it will be enought ?

each number got on each cd will be different ?

[philkr]

I can only guess. The best thing would be to burn two exactly identical CDs and try it.

[FireJocker]

Yes, I'll do that to check,

thanks.

[FireJocker]

How getting the drive where is running the .exe ?

thx

[philkr]

You can use GetDriveType() to check every drive letter until you get a CD-drive.

[FireJocker]

I got it

	if(::GetCurrentDirectory(sizeof(szDir) - 1, szDir)){
		driver = szDir;
		p = driver.Find("\\");
		driver = driver.Left(p+1);
		driver.MakeUpper();

		bSuccess= GetVolumeInformation(	driver, szVolName,MAX_PATH, 
&dwVolSerialNumber,
&dwMaxNameLength,
&dwFileSystemFlags,
szSystemName,MAX_PATH);
	 }

But are you sure this number is really single ?

it's composed of 10 numerics digits so it allow 10.000.000.000 - 1 possibilities, I thinks it's a little bit small for all of us seeing each CD are burnst each days

[philkr]

The number is DWORD which is 32 bit = 4 byte = 4.294.967.296 different values possible.
But besides this I can not guarantee anything, because I am no serial number specialist. Hopefully you will find one.

EDIT: The question is not if there exists a CD with the same serial number anywhere on the world, but if it is possible for a person without much effort to create a CD with an arbitrary serial and if he can also get to know what number he has to use.