hdd problem

my hdd works fine but does not show up in device manager or in computer managements. Shows up in explorer. The led also blinks ocassionally. Asus motherboard, Seagate 1T hdd. Windows XP sp3. Indexing is turned off. Partitioning and formatting was done with Partition Wizard v7. Could someone please help me with this. Everything works okay but these issues bother me. Thanks in advance.

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