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i have sata 3 1tb hard drive and it's always at over 80% in the task manager HELP!!!

Hi there Mr Terabyte,

What is your OS?

You can try several things:
- Disable several Windows Services like: Superfetch, BITS and Windows Search.
- Check out the drive's health: http://www.tomshardware.co.uk/forum/282651-32-best-diagnostic-testing-utility
- Double check the connections. You can use different SATA and power cables as well as connect the drive to another port.

Apart from all this, it would be nice is you check what is causing the usage in Resource Monitor as Roti-Kebab suggested.

Cheers,
D_Know_WD