what does 1tb hard drive mean
Okay, it's a simple thing to understand: 1  TB means Terabyte. It's equal to 1024 GB.  So an easy way to understand the amount of space it has is, suppose there's an HD movie of about 900+MB (~1024 MB = 1 GB). Your 1 TB hard disk can have around 1000 such movies and the 2 TB one can obviously have double of that.