Toshiba Portege 3010 & 3020
Linux on the Portege
There are several sites with instructions or software to help you put Linux on your notebook.
Linux on the Portege 3010: 1 2 3
Linux on the Portege 7020: 1 2 3 4 5
Linux on Laptops
Toshiba Linux Utilities
If you want to experiment with Linux while preserving your Windows installation, you might like to try a distribution like Knoppix. However, if you are set on using Linux it is probably best to use a normal distribution and customise it for lower system requirements.