Hello: Well I have few experience with dual systems, and I don't understand your idea. You can have a SSD Hard Disk wherein you install one or more OS. You don't need to have a lot of physical hard disk for that. In fact in only one you can get two OS doing the right partions in a common hard disk that still uses the MBR.
You can add an SSD HD and inside install both: Fedora and Ubuntu. You can create two primary partitions for that. The size of each one depends of the amount of software you'll need to install and use. I install and proof a lot of software in Ubuntu, so 20 GB are enough for me. If I don't need so much, 10 GB is ok. For upgrade easily I use to install the \home in an independent partition, that partition is huge because the most of all the information will be stored inside it. My suggestion is to install the OS in the SSD one an the home and other stuff inside another HDD. You can share the \home and the swap between diferent gnu/linux distros. Good luck
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