Question: If I partition my hard disk, is my computer going to perform faster/better?
In other words, the smaller the active partition is (the partition with the operating system), the faster the operating system? Is this true? Why?
Answer: No, it’s the opposite effect: By partitioning, your performance will decrease.
Your disk head will have to pass all the empty space from the current partition and the other partitions to get a file from a partition at the end, if all files were on a single partition it would take a lot less effort to get the file as you don’t have to pass a lot of empty space.
There’s no reason whatsoever to go for a smaller size disk/partition, it doesn’t make a difference.