Getting hard disk serial numbers through Oracle?

I am a programmer and want to protect my software from being copied by other users. In this connection, I want to get the hard disk serial number through the Oracle server.

You cannot directly access that information through Oracle. You'll need to create a C or Java program (for example) that gets the info and then you can call that program from within Oracle. If you can use Java to get what you want, you can create and compile the Java program inside Oracle and use it like any "normal" Oracle function. A good way to gather more info on creating Java procedures with Oracle is to search this site or even do a Google search for "Java Stored Procedures" and similar keyword searches. You'll also find lots of info on Oracle's TechNet site.

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