How does Photoshop decide that a disk can be a scratch disk?

Question

Adobe Photoshop

The computer has multiple physical and logical (NTFS) drives. When run as an administrator, Photoshop shows all logical drives in the scratch drive selection menu and allows you to select them as working. But dragging, pasting, creating a new file does not work under the administrator, and in general this is not very convenient and correct.

If you run Photoshop as a normal user (there are administrator rights), then the two largest logical drives are not shown in the scratch selection. The system partition and one of the SSDs are shown (the second SSD is not shown). Changed NTFS access settings - all operations are available to everyone. Partitions not shown are on hardware RAID.

The search gives only the answer: "To select scratch discs, click here and in the window that opens, click the checkboxes you need."

Answer 1

By default, fsh uses the disk on which the system is installed. With admin rights, the possibility is probably expanding. That's what root is right for.
Logical and should not be shown, they are logical. A logical drive is just a place away from a physical drive under a specific drive letter. This is a folder inside the disk, roughly speaking.
If you have at least 100 logical ones, then there will be 2 physical ones. And fsh in a normal and complete environment only works with physical ones.
You are trying to tell Photoshop that it needs to use a disk within a disk, and this is physically unrealistic, because in fact there is only one disk.
In your case, you need to make sure that the second physical disk is large enough for you to work with and specify it. But not his "internal dummy disk/partition". In short, assemble back from logical ones into one big one and use it.
But for starters, I would just try to rearrange the flash to that (logical) disk that you will use as a scratch.

Answer 2

Faced a similar problem. Photoshop offered to place the paging file only on the D drive. I found the answer here - run it as an administrator. And the fact that "But dragging, pasting, creating a new file does not work under the administrator, and in general it is not very convenient and correct." - everything is simple here - just run the program from which you drag and drop - under the administrator - and everything will be dragged! I launched Total Commander as admin and drag and drop into photoshop!