You cant. Let me put it to you like this, if you were to open up your partition like you stated above and remove the SYSTEM account from the list of users the drive was shared to, you would 'lose' that drive meaning that windows would no longer be able to see it or do anything to it.
The SYSTEM account is, essentially, your machine; it can do ANYTHING to the machine. Why would you need to login as SYSTEM anyway?
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