
What is nand?
Your psp nand, is basically your psp brain. It's the flash where everything is stored, making a "nand dump" is a COMPLETE backup of your psp, just not like flash0 etc..
It's not only used for a slim, that's just plain stupid.
You should dump the nand for better protection as that's the complete backup, and yes the slims need it more, as thats mainly their only protection against a brick.
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