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.
1. Turn off space check.
2. Hide the drive:
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.
Hello, the most recent update of Windows 10 -- V1803, Build 17134.48 -- added a D drive to my collections of drives, causing me aggravation as I had previously assigned that drive letter to my Dropbox folders. The additional annoyance is the periodic warning that the drive is running low on space. It appears to be a new partition of my first drive, created for no apparent purpose:
I cannot treat it like a regular drive; I cannot use built-in tools to reassign its drive letter. Why did Windows see fit to create this new drive, and more important, how can I remove or rename it?