HIDE DRIVE FROM OTHER USERS

There is a group policy setting to disable access to certain drives, and another to hide access. You need Windows 7 Professional, Ultimate or Enterprise to do this.

If you only want to apply the policy to certain users, not every user, you need to configure it individually. You cannot do this by just opening gpedit.msc; you need to add the group policy editor from the MMC:

1.  Run mmc.exe with administrative privilege    
2.  Click File > Add or Remove Snapin
3.  Select "Group Policy Object Editor" and click Add >
4.  A wizard will appear. Click Browse, click the Users tab, and select a user or user group.Individual users are shown, as well as two generic groups; "Administrators" and "Non-Administrators".
5.  Click OK, then click Finish in the wizard.
6.  Click OK in the "Add Snapin" dialog.
7.  Enter User Configuration > Administrative Templates > Windows Components > Windows Explorer.
8.  Find Hide these specified drives in My Computer if you want to just hide the drives but still allow direct access (e.g. from run prompt, etc.) to the drives. Find Prevent access to drives from My Computer to hide the drive and prevent access to it.
9.  In whichever settings dialog, choose the Enabled radio button and choose the drive(s) you want to restrict. As of Windows 7, the only options are:

•  A and B drives only
•  C drive only
•  D drive only
•  A, B and C drives only
•  A, B, C and D drives only
•  Restrict all drives
•  Do not restrict drives

    10.  Click OK
             The next time the user(s) log in, they will not be able to see/access the drive This should work as you specifically asked for disabling the D: drive.