> what I am asking is the 2.5/3.5 value. So I think this edit is wrong, so I rollbacked it.


And **that's what** is highlighted in the revision 2 of the post.

> What does the 2.5"/3.5" value indicate? The thickness?
>
> I want one of my friends to buy a 1TB hard disk for me, but I have no idea about this value. I only know that 7200rpm is better (than 5400rpm).

**Where** is your concern about 

  >  because I know what does 1 TB stands for, what I am asking is the 2.5/3.5 value. 

getting ignored? Your question was changed from 



> Usually I just buy a harddisk, but
> this day I discover there is a
> difference of something 2.5" vs 3.5"
> to choose from.
> 
> WHat does this 2.5 3.5 thing indicate?
> the thickness?
> 
> I want one of my friend to buy a 1 tb
> harddisk for me, but I have no idea
> about this thing, I only know 7200rpm
> is better.
> 
> I am afraid if the 3.5" thing is
> bigger in size, and my friend buy me
> this, and I afraid if there will be
> any chance that the hard


to 

> What does the 2.5"/3.5" value
> indicate? The thickness?
> 
> I want one of my friends to buy a 1TB
> hard disk for me, but I have no idea
> about this value. I only know that
> 7200rpm is better (than 5400rpm).
> 
> I am worried that the 3.5" drive may
> be physically too big.


The second edit has not only resulted in a more concise question, but also one that's more readable, better grammatically and something which can be answered by reading the first sentence of the question. I don't know what you're arguing about, the rollback wars were senseless and **that's why** I locked it. 

Contrary to what most people think, Mods don't have a fetish to close and lock questions. We're here to ensure everything goes on smooth and fine. And the earlier people understand **why** is it that their posts are getting edited, closed & locked upon, the better it will be for them - not only in Stack Exchange but everywhere.