Partition in 3 parts then.
/ (root) 20 GB Partition ext4 /dev/sda1
/home 137 GB Partition ext4 /dev/sda2
swap 3 GB Partition swap /dev/sda3

/ (root) is where your programs, the kernel and important system files, and pretty much everything goes.
/home is your personal directory that you have quick and easy access to and is always the default folder for everything. it will contain all your media, music, video, images and personal configuration files.
swap is virtual memory like a paging file on Windows. It also serves as the place where hibernation images are held. It is required for suspend to disk, and must be at least the size of your ram, if not about a half GB bigger to be on the safe side.

The problem is that distros like Fedora don't let you choose your partition layout. It creates this weird LVM layout by default.

That's one more reason to like Arch!

Last time I saw Fedora, the default is LVMs, but its not enforced; you do have a choice.

z99 ,do a fresh installation of fedora core, leave 140 GB unallocated during installation .
After installing fedora make those 140 GB to VFAT by fdisk utility .
U should use VFAT for ur 140 GB to store data ,bcoz it can be accessed smoothly by any distriburtion of linux or windows ..

thanks MTK358,leopard,chrism01.
thank you divyashree,
is this what i should do?
/root 20 GB Partition ext4 /dev/sda1
/home 5 GB Partition ext4 /dev/sda2
swap 4 GB Partition swap /dev/sda3 [ram=2gb]
after installation with fdisk change 140 GB to VFAT!
is that it?