Is it possible to boot a computer from a sd card, and use the sd card as a harddisk?

[vivitron 15]

as for the quiet, fanless cpu, try mini-itx.com

i reckon you'll also find some articles covering booting from usb sticks/cf cards etc.

[Virtualbody1234]

Check out these USB 2.0 flash sticks.

http://www.kanguru.com/flashdrive.html - up to 8GB capacity

and

http://www.kanguru.com/flashdrive_max.html - up to 64GB capacity!

[Darth Sushi]

Check out these USB 2.0 flash sticks.

http://www.kanguru.com/flashdrive.html - up to 8GB capacity

and

http://www.kanguru.com/flashdrive_max.html - up to 64GB capacity!

STARTING PRICE: 800 bucks!

[Virtualbody1234]

Yeah and the 64GB version is: $2,799.95

[lynx]

Yeah and the 64GB version is: $2,799.95

Cheep. At least, that's what my bird says.

[tesco]

and btw do you know what is the powerfullest fanless cpu?

I'd like to build a computer, not so powerfull, but totally silent.

I dunno what the most powerful one is but just a tip is to still have the fan and use the program 'speedfan' to control the fan's speed, let it go 0% as long as the temp is below X.

For example, ofor my athlon xp 3000+ I have speedfan set to go on at 36degrees so basically I never have a CPU fan running unless I'm playing games or extracting something.
It's silent when I want it to be, yet i'm safe from it overheating.