If you want to call disk class methods from a base class, declare the class method in your disk class as follows: using the (+) sign in front of the method name.
+(void)myClassMethod;
Call this method from the base class as follows:
[YourDriveClassName myClassMethod]
, , (-) .
-(void)sayHelloToSomeOne:(NSString *)greeting;
.
[super sayHelloToSomeOne:@"Hello Worlds!"];