How do drives be reset?

[Mudozs]

If our informations get stored in + and - protons, how does a drive looks like if it gets cleared? Are the memory cells are all set to zero so - protons? And could you physically reset them with a magnet or something?

 

[Ghideon]

8 hours ago, Mudozs said:

If our informations get stored in + and - protons, how does a drive looks like if it gets cleared?

Can you clarify the question a little? Protons are only positive (+). I do not know any drive that fits your description; are you asking about a hypothetical device? If you wish to discuss regular off-the-shelf hardware do you wish to discuss SSD* or HDD or both?

 

*) HDD, hard disk; electro-mechanical data storage device that stores and retrieves data using magnetic storage. 
SSD, solid-state storage device that uses integrated circuits to store data persistently

[StringJunky]

That depends on the wiping protocol. It could be the equivalent of all 0's or 1's or some other pattern.

[MigL]

Magnetic storage drives use magnetic domains, while SSDs use 'flash' which stores electrons in 'traps' of 2 or more voltage levels.

They are usually cleared by re-formatting, which essentially wipes the index of the stored data.
A good recovery program can still read this data, unless over-written, and good wiping programs usually over-write all the data to prevent this ( but that may take a while with >terabyte HDDs ).