Autoinstall is using BOTH /dev/sda and /dev/sdb how to tell it NOT to use /dev/sdb

[Jerry Geis]

I am trying to autoinstall on a new NUC7CJYB it has onboard disk 32G
that shows up as /dev/sdb

I ONLY want to install on /dev/sda (120G)

How do I tell auto install to IGNORE sdb ?

My section for disk:
  storage:
    layout:
      name: direct

Why its SPLITTING part on /dev/sda and part on /dev/sdb I dont know.
I have tried in the BIOS to disable /dev/sdb but it seems to still show.

Jerry
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