Typically, USB ports are attached directly to the computer's motherboard (the circuit board) unless, for example, you have additional USB ports on the front of your computer (which may be connected by a wire, and in which case could be replaced). So no, USB ports are usually soldered directly onto the circuit board and cannot be replaced without professional repair.
The Atom N270 laptop has three USB 2.0 ports.
This is not possible. The speed of the USB controller is based on its complex chipset, which cannot be feasibly replaced. If you want USB 2.0 ports on your laptop, you will need to purchase a PC Card with a USB hub.
There is no minimum or required number for USB ports on a laptop. Depending on the age and design of the laptop, it could be anywhere from zero to ten. I have seen only 2 USB ports on older laptops, most of the new ones atleast have 4 USB ports. Netbooks(10" & 11") have not more than 2 USB ports. If in anycase you need more USB ports, you could buy an USB hub for as less as 10$, which will add 4 more ports to your laptop.
USB ports
Well depending on what usb ports it has usb 3 ports are the best to use.
This laptop features three Hi-Speed USB and four pin USB Type A ports.
All national ports have been closed.I need more USB ports on my laptop.
No. The reverse is the case. Parallel ports are older technology and have been replaced by "printer ports" which accommodate special USB cables with printer plugs.
You need to place the USB fan cooler beneath your laptop and connect it to one of the ports for it to cool your laptop.
You cant, its either going to be usb 1.0 or usb 2.0.
There are 4 USB 2.0 ports on this laptop. In addition, there is also a firewire (1394) port and an HDMI port.
The Sony VAIO VGN-NS130E/S, comes with 4 high speed USB ports, and 2 memory slots.