So I've looked up the following:
Damn Small Linux - Small but its UI looks like something from Windows 2000 all grey. Ugh, kinda ugly now.
Tiny Core Linux - Same as DSL.
Puppy Linux - Looks fine.
Mint Linux "Petra" Edition - UI's quite nice but the download size is over 1GB. I might give it a try anyway.
LXDE - Great UI and by what it says it runs smoothly on old machines.
Is this serious? 6,4GB is barely enough to install a modern OS nowadays.
Elementary OS is nice but last time I checked it lacked many features that a linux OS is expected to have. I would recommend Linux Mint LXDE 32-bit.
LXDE is one of the most lightweight linux GUI out there and Linux Mint is fast and easy to use.
I have used Damn Small Linux before but I found it to be not as user-friendly. But it might be the best option to save hard drive memory
Yep. It is
that small.
It's also worth noting it has another storage compartment but only holds up to 3GB which is sorta pointless.