What you’re seeing makes sense, and it’s not Windows “hallucinating” so much as
drive-letter conflicts + per‑PC letter assignment + a Google Drive quirk.
1) Why Explorer shows Google Drive G: but Disk Management doesn’t
Google Drive for Desktop can “claim” a drive letter (often
G:) in File Explorer, but it
isn’t a real disk volume, so it usually
does not appear in Disk Management.
So Disk Management may happily assign
G: to one of your Samsung partitions, while Explorer shows
Google Drive as G:. That makes it look like:
- Explorer: “Google Drive is G: and my partitions got renumbered”
- Disk Management: “one of the partitions is G: and there is no Google Drive”
Fix (best): change Google Drive’s letter
On the Lenovo, open
Google Drive for desktop →
Settings (gear) →
Preferences/Settings → look for
Drive letter and change it to something out of the way like
Z: (or just uninstall/disable Google Drive if you don’t need it).
After that, your external partitions will stop “fighting” with Google’s G:.
2) Why letters change when you reconnect
Drive letters are assigned
per PC, and Windows will reuse the “next available” letters depending on what’s already taken (including virtual/mapped drives like Google Drive). So yes:
Volume Labels are the stable identifier, and your plan to rely on labels is sound.
If you ever want to stabilize letters anyway, the best trick is to assign your external partitions on each PC to
high letters (like
R:–Y:), so internal disks and apps don’t collide with them.
3) “There is a drive error” popup when you connect
That usually means Windows thinks the drive/volume was not closed cleanly at some point (even if you waited for the LED). For external SSDs, the safest way is still
Eject/Safely remove—but you’ve had trouble with “in use”.
Do this
GUI-only check on the Lenovo for the partition you care about (repeat for any that matter):
- File Explorer → right‑click the partition → Properties → Tools → Error checking → Check
If it says it repaired something, reboot once afterward.
4) Why Action → Rescan Disks was greyed out
That’s usually just Disk Management not having focus, or the console being “busy”.
Try:
- Close Disk Management.
- Reopen it (Win+X → Disk Management).
- Click once on the left tree item Disk Management (so it’s “active”).
- Then check Action → Rescan Disks again.
If the external SSD “lights out” / disconnects while you’re doing this, Rescan may stay unavailable until Windows sees the device again.
5) About %localappdata%\...\FileHistory showing only Data
That’s fine. If File History is OFF (and/or you already deleted Configuration earlier), Windows may only show
Data until File History is turned on and recreates
Configuration.
What I’d do in your exact situation (minimal steps)
1)
Change Google Drive letter to Z: on the Lenovo.
2) Run
Error checking (Tools → Check) on the partition you want to use for File History.
3) Reconnect the SSD and see if drive letters stop changing oddly. (Labels will always be reliable either way.)
If you can post one screenshot of:
- File Explorer → This PC (showing Google Drive + your partitions), and
- Disk Management (the lower pane showing the partitions + letters),
I can tell you exactly which letter conflict is happening and what single change will make it stable.