I don't know the presise reason for you not being able to see it in My computer but even if you could you wouldn't be able to access this partition because of the security permissions set by the other OS.
Still I could be wrong and you should use c:\WINDOWS\system32\compmgmt.msc to see what your HDD(s) are doing. You want disk management from the mmc.
MartyMcFly
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