To Hide any Drive

Open cmd type- Diskpart

after that type -list volume
it Show all volume list
than select the disk that u want to hide
Example-select volume 1
after selection type-remove letter c
if u want to another drive write after letter
than press Enter ur drive will hide
to show type- Assign letter A

Open Command Promt In any Folder

type this code in notepad
REGEDIT4 [HKEY_CLASSES_ROOT\Directory\shell\cmd] @="Open Command from here" [HKEY_CLASSES_ROOT\Directory\shell\cmd\command] @="cmd /k \"cd %L\""

and save it as "Command.reg". open it and look on right click of folder there is an another option add "open Command window here".