Some answers I had to look up, I provided links

FAT = File Allocation Table

Memory Paging = Basically pages of memory stored on disk typically in a swap file
(see: http://aips2.nrao.edu/docs/glossary/v.html#virtual_memory)

Expanded vs Extended = Good question. Hard to explain
(see: http://www.webopedia.com/TERM/E/expanded_memory.html)

Linux Filesystem = ext2 filesystem is the most common. Others are in development.
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