ACLs, partitions and users profiles

Hi

In Windows7 SP1, I noticed that the ACLs of the root directory of a logical partition (D:) formatted NTFS are different from those of the root directory of the system partition (C:):

Code:

C:\Windows\system32>icacls c:\
c:\ BUILTIN\Administrators:(F)
    BUILTIN\Administrators:(OI)(CI)(IO)(F)
    NT AUTHORITY\SYSTEM:(F)
    NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(F)
    BUILTIN\Users:(OI)(CI)(RX)
    NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(M)
    NT AUTHORITY\Authenticated Users:(AD)
    Etichetta obbligatoria\Livello obbligatorio alto:(OI)(NP)(IO)(NW)
 
Processing is complete for 1 file. Processing failed for file 0
 
C:\Windows\system32>icacls d:\
d:\ BUILTIN\Administrators:(F)
    BUILTIN\Administrators:(OI)(CI)(IO)(F)
    NT AUTHORITY\SYSTEM:(F)
    NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(F)
    NT AUTHORITY\Authenticated Users:(M)
    NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(M)
    BUILTIN\Users:(RX)
    BUILTIN\Users:(OI)(CI)(IO)(GR,GE)
 
Processing is complete for 1 file. Processing failed for file 0

Why?

If I were to move, in the logical partition, the users profiles (except the default profile) and the public directory, should I also change its ACLs to get a stable, secure and coherent or not?

In particular, I wanted to know if these differences are caused solely from the partition type or if these work even on other levels of the system and users security.

Thanks

Bye