43 KDE installer allocating more than unallocated space on drive when trying to dual boot?

[nicehuman]

Hello, this is my first time installing Fedora and I am unsure precisely what is happening or how to proceed.

I want to dual boot Fedora 43 KDE alongside windows on my laptop, it only has one SSD slot so I need to use the same drive for both OS, luckily I have 1TB in there so space is not an issue.

I shrunk my windows partition to leave 634.77 GB free, this shows up correctly in KDE partition manager.
Setup Fedora 43 KDE live usb, and worked through the installer, installation method as share disk and reclaim space unchecked.

The problem: In the review section it states that 679GB will be used for both the / and /home directories, greater than the 634.77GB unallocated space on the drive.

I’m not sure how to have fine control over the partition allocation/generation in this version of the installer (Can’t find any guides), nor can I find any explanation for what is occurring, any help would be amazing

[pg-tips (P G)]

Two things here:

1. The installer screen shows “679 GB” twice, but this doesn’t mean that 2 * 679 = 1358 GB is being allocated. It wants to create a single 679 GB partition (nvme0n1p6) with two btrfs subvolumes (one for / and one for /home).

2. You have different units on the two screens there: GiB vs GB.

   1 GB = 1,000,000,000 bytes
   1 GiB = 1,073,741,824 bytes (i.e. 2 to the power of 30)

   So 634.77 GiB = 681,579,097,620 bytes = 681.58 GB - which is a little bit more than the installer wants to use for your btrfs partition.

[nicehuman]

What a rookie mistake I’ve made, ouch. Yep it was GB vs GiB.
Thank you very much for pointing that out, that would have haunted me (though now it will in a different way).
I ended up doing manual partitions which ended up being fun and helped me learn some stuff, but could have saved myself the trouble.
Thank you again!