TECHGAGE looks at the biggest and fastest 2.5 HDD from Seagate, the Momentus 5400.3 160GB.  Living out of a laptop is becoming more common, and this drive looks to address almost any storage need, without forcing you to carry around external drives in your bag. 
If you demand to be mobile and still have the hard drive space you need, then you should look at the Seagate Momentus 5400.3. It’s the first mobile drive to be equipped with a full 160GB of disk space, and still retains great speed.”

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