Windows 10 / 7 Dual Boot. Either Boot see other OS. Is this sensible?

I have a Windows 10 / 7 Dual Boot PC using the only Hard Drive. Many thanks to those who enabled me to achieve this.

When the PC is booted into Windows 10 or 7, certain programs can see the other Drive (OS). For example, Windows 10 built-in defragmentor, Defraggler and BitDefender. So, I could defrag my 'D Drive' from my 'C Drive'; is this wise? If it is unwise then how can I hide the Drive (OS) that is not the booted one.

Note that BitDefender checks both the C and D Drives irrespective of what the Boot Drive is!

Thanks, Norman

If you wish to hide the other OS drive, using the admin tools "Computer Management"/"Disk Management" - Change Drive Letter - Remove; this means the drive would not be seen is explorer.

As to sensible, no idea, but I would not do it.

It's strictly a matter of personal preference. No harm will be done by removing the other OS drive letter unless you have links actually pointing to that drive letter.

Jimmyb & NavyLCDR, Thank you for your advice. Have booted each OS and removed the drive letter for the non-booted partition.
I can only see the booted drive in such programs as Defraggler which makes me feel more comfortable. With BitDefender, only the booted drive is being checked which makes the operation much quicker. This behaviour is as expected and is my preference.

Cheers,
Norman