Ok i dont mean the required space for the software on the TB but look at this ill open up my terabyte(nothings hidden) and i will highlight everything right click press properties wait a moment and it tells me how much stuff is on it...... here is a picture for a better example
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My Computer
At a glance
Windows 7 (may switch to a linux distro)3.00
- Computer Manufacturer/Model Number
- Toshiba Satellite....
- OS
- Windows 7 (may switch to a linux distro)
- Memory
- 3.00
- Hard Drives
- I have a terabyte......and then what ever is in my laptop