It seems the update removes the hide drive letter registry entry as well as the nospacechecks as well.

It's a goof. And the drive was always there (100% of the machines I've found with this complaint) so far.

For folk that want absolute control of their PCs, Windows is not for them Let's get that out of the way and move onto where/what registry entries hide letters and space checks.

Links follow:
1. Turn off space check.
https://www.google.com/search?q=NoLowDiskSpaceChecks+registry+windows

2. Hide the drive:
https://www.google.com/search?q=hide+drive+letter+registry+windows

In closing I've seen folk run out and use diskpart or GPARTED, remove the partition and have a non-booting drive. This is why I don't touch the OEM partitions.