You might find these articles helpful.

1. https://www.partitionwizard.com/partitionmanager/drive-letter-is-missing-in-windows.html

Note that in the topic Drive Letter Disappears after Reboot, Western Digital HD's can be suspect on this problem.

2. https://www.sevenforums.com/hardware-devices/223403-drive-letter-disappear-after-reboot.html

Note that the same problem is attributed to a Western Digital HD.


BIAB2024
Windows 10 Pro
WA6NCB