How much slower: compare the blue bars (NTFS-3G) with the red bars (ext3) on [http://www.tuxera.com/products/tuxera-ntfs-commercial/performance/ this graph].
To know what device (/dev/sdX) you need to partition and format, use the following command, in a [[Open Terminal, as root|Open Terminal , as root]]:
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==Using cfdisk==
From a [[Open Terminal, as root|Open Terminal terminal, as root]], type '''cfdisk /dev/sdX''' to launch the cfdisk application.
Make sure to replace /dev/sdX with the actual device (eg. /dev/sdb) that you found above.