Thank you all for trying to help me fix the problem I face.
Basically I have tried everything mentioned, including clearing USB history, but failed to bring back “Safe to Remove Hardware”.
In response to bluebolt, I did the following:
- Restore the system from Ghost image that bring back “Safe to Remove Hardware” balloon
- Tried flash drive that has never been introduced to Windows 10 (or better-mentioned USB 3.0 port under Windows 10). It works perfectly alright, event after trying many times, even after reboot, “Safe to Remove Hardware” balloon still comes up normally
- Once I tried with a flash drive that has been plugged into Windows 10, the “Safe to Remove Hardware” balloon disappeared, even for the flash drive that has never been introduced to Windows 10.
As I mentioned earlier, that a file or a program might have prevented hotplug.dll from showing Safe to Remove Hardware” balloon. I recall that Panda Free Antivirus has USB Protection, I tried to disable the USB Protection, no change. But when I stop Panda Free Antivirus, voila…. “Safe to Remove Hardware” balloon come back! What a good luck!
Now I uninstalled Panda Free Antivirus, and the “Safe to Remove Hardware” balloon works normally. But the connection with Windows 10 is still puzzling.