Microsoft explains: “Example: An upgrade to the May 2019 Update is tried on a computer that has the October 2018 Update installed and also has a thumb drive inserted into a USB port.
“Before the upgrade, the device would have been mounted in the system as drive G based on the existing drive configuration. However, after the upgrade, the device is reassigned a different drive letter. For example, the drive is reassigned as drive H.” But it does not just impact USB drives even though that is what triggers the problem. Internal hard drives can also be affected. In that case, the letter of your hard drive might be changed and then Windows might not be able to find files because the letter of the hard drive has changed.
Many of us have had all kinds of problems with Windows 10 because of updates. But this particular issue should be fixed before any of us are impacted by it.
______________
You might also be interested in: