Does Mac OS UUID depend on hard disk?

I use this code to get UUID on Mac OS

NSString* getComputerId()
{   
    io_registry_entry_t ioRegistryRoot = IORegistryEntryFromPath(kIOMasterPortDefault, "IOService:/");
    CFStringRef uuidCf = (CFStringRef) IORegistryEntryCreateCFProperty(ioRegistryRoot, CFSTR(kIOPlatformUUIDKey), kCFAllocatorDefault, 0);
    IOObjectRelease(ioRegistryRoot);
    return (NSString*) uuidCf;
}

Does this UUID depend on hard disk? Will UUID change if users 开发者_运维百科replace their hard disk?

There's no mention of the HDD in the CFUUID documentation