i've always felt the noise argument is just a lame excuse to say why you'd mod a console.Well, I suppose hacking every console is legal within limits. For example :
PSP : Playing homebrew and using awesome plugins ( if it wasn't for joysens my analog would've been dead now because replacing it doesn't do so good ) and playing legal backups. UMD's make noise, and are very slower than ISO's.
PS2 : Not so much except for playing legal backups, and it'd be greater from internal hdd + network adapter
Xbox 360 : Playing legal backups ( as you know if you accidentally move your 360 while playing your DVD will have many scratches so it's good to have a backup of it ) and playing from a hdd if your 360 can be jtagged is great because it reduces the noise.
That's all I could remember.
I'm pretty sure it says Iphones or DVDs. Nothing about PSPs or other devices.