After discussing the matter of whether the Death Note will ever run out of pages, it appears to me that there is another unclear matter, which is whether the page itself can ever run out?

You can easily take a page, use an erasable pen and write carefully, then when filled, erase the entire writing without damaging the page. You will always be able to kill other people using that same page. I have the following sub-questions:

1. Is this even possible, that is, can you kill people after writing on an erased page?
2. When do we say that the Death Note has run out? See the picture below¹, which says that when you run out of room to write, you can ask your Shinigami to bring you another Death Note.
3. If I fill my note, ask the Shinigami for another one, then erase what was written on my first note, will I have made two Death Notes for myself?
4. If the above is true, and since the rules imply that no more than six Death Notes can be brought to the human world, why didn't Yagami Light do that to get six Death Notes, ensuring that no one else gets a Death Note?
5. How does the Shinigami tell that the Note is filled or not? Does he just look at the pages and see whether they are written or not?

¹ Death Note Manga Pilot, Chapter 0, page 26.

After discussing the matter of whether the Death Note will ever run out of pages, it appears to me that there is another unclear matter, which is whether the page itself can ever run out?

You can easily take a page, use an erasable pen and write carefully, then when filled, erase the entire writing without damaging the page. You will always be able to kill other people using that same page. I have the following sub-questions:

1. Is this even possible, that is, can you kill people after writing on an erased page?
2. When do we say that the Death Note has run out? See the picture below¹, which says that when you run out of room to write, you can ask your Shinigami to bring you another Death Note.
3. If I fill my note, ask the Shinigami for another one, then erase what was written on my first note, will I have made two Death Notes for myself?
4. If the above is true, and since the rules imply that no more than six Death Notes can be brought to the human world, why didn't Yagami Light do that to get six Death Notes, ensuring that no one else gets a Death Note?
5. How does the Shinigami tell that the Note is filled or not? Does he just look at the pages and see whether they are written or not?

¹ Death Note Manga Pilot, Chapter 0, page 26.

Intro

After discussing the matter of whether the Death Note will ever run out of pages, it appears to me that there is another unclear matter, which is whether the page it self can ever run out?

One can easily take a page, use a erasable pen and write carefully, than when filled, erase the entire writing without damaging the page. You will always be able to kill other people on that same page.

Questions

Now there is some question:

Well first, is that even true? (you can kill after writing on an erased page)

Secondly, when do we say that: The Death Note had run out?.. (look to picture below ¹) It says that when you run out of room to write you can ask your Shinigami to bring you another Death Note.

-Well what if I fill my Note, ask the Shinigami for another one, than erase what was on my first Note again, will I have made two Death Notes for my self? (let's call this X, and let's suppose that Z is true.)

And last, the rules imply that no more than six Death Notes can be brought to the human world, well if X is true, than why didn't Yagami Light do that to get six Death Notes and ensure that no one else in the world will get a Death Note?

Basic Question..

How does even the Shinigami tells that the Note is filled or not? does he just look at the pages and see whether they are written or not? (let's call this Z)

Sorry for this but the rules of the Death Note are a bit confusing.

¹ Death Note Manga Pilot, Chapter 0, page 26.

After discussing the matter of whether the Death Note will ever run out of pages, it appears to me that there is another unclear matter, which is whether the page itself can ever run out?

You can easily take a page, use an erasable pen and write carefully, then when filled, erase the entire writing without damaging the page. You will always be able to kill other people using that same page. I have the following sub-questions:

1. Is this even possible, that is, can you kill people after writing on an erased page?
2. When do we say that the Death Note has run out? See the picture below¹, which says that when you run out of room to write, you can ask your Shinigami to bring you another Death Note.
3. If I fill my note, ask the Shinigami for another one, then erase what was written on my first note, will I have made two Death Notes for myself?
4. If the above is true, and since the rules imply that no more than six Death Notes can be brought to the human world, why didn't Yagami Light do that to get six Death Notes, ensuring that no one else gets a Death Note?
5. How does the Shinigami tell that the Note is filled or not? Does he just look at the pages and see whether they are written or not?

¹ Death Note Manga Pilot, Chapter 0, page 26.