Is the write 0 drive could be used after writing 0s? is format not enough

[jraju]

The problem is that i could not select some small unallocated partitions in it. How to do it. I want to clean and format the drive as if i bought it from store. Moreover, is it possible for physical damage to hard disk, which is covered in your hard ware cabin, or not touched by us at any time of install. we only once, insert and screw it.
Is there any fixed amount of rotation for a hard disk? if that reaches, you are bound to get failing process?
please also see this link

How i got those unwanted partitions?

Hi, I am using wd internal drives for the past two years. Initially i did not notice this. But whenever there is corruption of os, and while re installing the windows, more drive options would show me a partition of 0kb (actuallly near 1 mb size) other than the cusomized partiton. It can not be formatted or deleted, but will allow reinstall in other partitions. I tried to delete but failed in each time. I deleted all partions and when i click to create new partitions, this would come up, when y…