LANDZ has nothing whatsoever to do with the internet, performance of your system or drive, or any other factor in your system
Landz - refers to the landing zone of the hard drive. All drives have them - it's the area on the disk saurfce where the heads come to rest on the disk surface when the drive stops. It's an internal drive thing, and all modern drives are auto-parking anyway - that is, when power is removed from the drive, the heads automatically move to the landing zone as the drive spins down.
You don't need to even set this parameter, you should be setting your BIOS to Auto for the drive type - this is the default and recommended setting.