One question is does the laptop have a recovery partition? If so then this would reduce the size of the drive. Additionally, 80,000,000,000 bytes isn't 80 GB but more like 75 GB, since 1024 bytes = 1 kilobyte, 1024 kilobytes = 1 Megabyte, and 1024 Megabytes = 1 Gigabyte, as I've had both a laptop and desktop system where the 80 GB drive is more like 75 GB once windows has formatted the drive.
Sony literature, to include the sticker on the packing box, states the VGN-N130G/W laptop has a hard drive capacity of 80GB. However, when I did a system check/status it read: Local Disk: File System: NTIFS, Free Space: 57.3 GB, and Total Size: 69.0 GB. Am I missing something? It appears the system is lacking 11.0 GB of its advertised 80 GB capacity. Obviously, I purchased the laptop because of its advertised 80 GB capacity. Those of you who have this laptop, do a similar check and let me know if you have a similar discrepancy. If so, does anyone have any suggestions as to how this can be rectified. Thanx.