I got several useful emails full of advice from Linux Emporium about the various partitions on my internal hard disk. Apparently the unused partition is there so that the user can install two operating systems side by side if they so wish. They say I could dispense with this and add it to my user space, but between it and the large user space I already have is a swap partition of 3GB. So, if I wanted to merge the user spaces into one, I would first have to build a new swap partition at the bottom of the space. I have no idea how you format a partition as 'swap', and perhaps all this is not really worth while just to gain 22GB of extra user space. But it's very interesting.
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