Selecting a startup disk when you put a firmware password on a Windows single-boot Mac

Usually, when you put a firmware password on a Mac, you can double-check in System Preferences > Startup Disk to see if the proper startup disk (or any startup disk) is selected.

Since the default behavior of the firmware password is you needing to enter the password in order to boot from anything other than the startup disk, you probably want to have a startup disk selected (otherwise, you'll get the folder with a question mark inside of it when you boot up).

In most cases, this isn't that difficult, but if you set up a single-boot Windows installation, you may not always see it available for selection if you boot to recovery mode or boot to macOS from an external drive.

Instead, you may want to just boot into Windows (hold down the option key and enter the firmware password if you need to this one time), and then launch up the Bootcamp Control Panel, and you can set the startup disk there.

Windows Explorer and Disk Management reporting different partition sizes

I ran into an issue with a user running Windows on a Mac. Windows should have taken up the entire drive (which is 250 GB), but Windows Explorer was reporting about 90 GB.

windowspartitionwrongsize01
The really odd thing is that within Disk Management itself, it reported 90 GB on top (same as Windows Explorer) but then 250 GB on the bottom... and no empty space after the partition.

I found the solution here:
I Expanded the Disk in Disk Manager but It Doesn't Show in Windows Explorer

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Launched up cmd.exe as administrator and then ran

DISKPART
List Volume
select volume 0
extend filesystem
and then it was all good.