Is there any information on the standard hard disks that netbooks use, are they just standard SATA notebook drives?
Most are using the SATA Hard Disks (2.5")... You can still find some with SSDs, but it seems as though manufacturers have shifted back to the SATA drives in favor of more storage space.
I recently purchased the Toshiba NB205 and am in the process of upgrading the RAM to 2 GB and putting Windows 7 Ultimate on there. I thought about adding a SSD, but I should do that in my primary machine's first...
So to sum this all up... 2.5" SATA Hard Disks seems to be the current standard, but you need to check the specs on the specific models...
It depends, currently most laptops have 2.5" SATA HDDs only.
You can have a look at Hard disk drive (Wikipedia) for more information.