When adding a new drive to a VM, how do I use the full size without guessing?

If I buy an 8TB drive, ideally when adding a hard drive to a VM and it asks me for how much, saying "8000" would work, but as we all know, the true number available is some number that has to be calculated with variables like "how is it formatted?" etc. Why is there no "all available" option? Ad barring that, how can I know what the largest number is? My 8TB drive says it is 7.83TB in the disks section, so of course I try "7830", and of course "nope". I then try 7829, etc, until I give up...

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