Hiding a partition in Windows is not an all-users trick.
There are also partition programs (e.g. Paragon's) who supposedly hides your partition just as well, but in reality the partitions are hidden FOR THE CURRENT USER ONLY.
I had a bad surprise to see that I hid 3 partitions as an Administrator, then I went to Guest account (limited user) and all my "hidden" partitions were visible like nothing happened. And restarting my computer did not help either.
I think the reason is because it's only a Registry settings and that setting is User-dependent, not system wide.
A solution would be to try the Security settings in Properties (only for NTFS partitions, you can set permissions for listing, writing/reading, etc)
A better but more complicated solution is to encrypt the partition entirely (google TrueCrypt freeware), or mount hidden file-volumes.
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