Windows 8 and Windows 10 have a new "feature" called "Fast Startup", "Fast Boot", or "Hybrid Boot". This is a form of mini-Hibernate Mode.
Unlike full Hibernate, this is not documented in the Shutdown User Interface and is enabled by default.
If you Shutdown, not Restart, Windows 8 or 10, this Mode will save the File Cache in the Hibernation File.
If you then modify any of these Cached Drives using a different OS Instance, then access it again from the original OS Instance,
the Cache will not match what is on the Drive. If you then make changes, the Cache will be written to the Drive possibly corrupting it.
Windows often writes to Drives in the background, so you can corrupt a Drive even if you do not intentionally write to it.
There are numerous reports of this problem along with instructions on turning off Fast Startup on Google.
I strongly recommend that anyone using Multi-Boot or swappable Drives, including Virtual ones, disable Fast Startup if using Windows 8 or 10.
In a pinch, always select Restart, not Shutdown, when closing Windows 8 or 10 if Fast Startup has not been disabled.
For those of you not born yesterday, never put a writable Floppy Disk into a Windows 10 system. It will be corrupted even if you don't intentionally write to it.