Choose a disk for downloading OS

I have a problem, I don’t have a flash USB and then I decided to create partitions for etcher to download linux. I have only 1 disk with windows 11. I did 3 partitions: 1st for windows, 2nd for Linux ISO, 3rd (with fat32) for Linux system. But balena thinks that it is 1 disk, how to make 2 disks instead? Pic is on Russian, sorry
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