USB booting :: what all can i do with it



I have used Unix for years a work, but no longer.  I miss it so I purchased the USB install of DSL to see if I might like to run Linux at home on my PC.  I haven't installed yet but have a few questions about it's capabilities.  If I run DSL from USB, will I be able to see my hard drive's in my PC as well?  Meaning say I download something large from the internet, will I be able to save it on my hard drive?  I understand that this can be ran inside windows.  What would be the purpose in that?  I know these are pretty basic questions, but I have never ran any form of Linux, especially a "mini" version.  Also, I just looked at the "mini computers" DSL is selling and wonder what would be there main purpose as well.  I mean there is no storage capacity so there is no way to save or load something other than on the pen drive that is running the OS?
anyone...anyone...Bueller?
see this thread

http://damnsmalllinux.org/cgi-bin....25;st=5

thx!  Also, if I am not going to run it in windows, but boot from the USB pen, can I then see the hard drive on my pc?
yes.
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