Hi,
I have a router who have a NAND flash memory who contains a linux filesystem, and I want to know if it's possible to dump the NAND with the arduino Uno ? Because I haven't found anything about NAND memory and the arduino on the internet.
Thx 
I don't see why not. You have access to its address lines, data lines, control lines, Power & Gnd pins?
You will read a byte, send it to PC to store it or similar?
I have the datasheet of the chip and I want to store it.
I am beginner in this field, do you have websites to advise me on the flash memory (I / O, ...) ?
Thx
No I don't. If it's more than 1Kbyte or so, you'll have to save it elsewhere.
Read up on Processing, see if that will let you save received data to a file.