I'll try to explain it once and it's good that no one comes back to it a million times. The administrators and moderators of the forum have probably had enough :)
First of all, it all depends on the recorder and its, so to speak, intelligence in recognizing what it can do with the disc and what it cannot.
As the successor to DVD-R, Standard DVD+R is slightly newer and has several advantages over its predecessor.
1) media damage correction system. This allows you to bypass defective sections of the disc during recording (the disc is unlikely to "crash" when it encounters a slight damage to the medium). Thanks to this, we have greater accuracy and confidence in the recorded data.
2) Both types of discs also differ in the recording technique and speed.
As for the technique DVD-R burns from the inside, DVD+R burns from the outside. Although it does not make a difference to the user because he sees the same data, only written differently. This is because when we record a dvd+r disc (e.g. 1024mb 1GB), the recorder will start burning in the place where it would end on a dvd-r disc, therefore in dvd recorders (those connected to a TV) you cannot overdub data on discs dvd+r (but this is also changing - see below)
As for the speed With a DVD+R disc, it writes at a constant speed. This method allows you to save information anywhere on the medium without changing its speed and thus for faster data writing.
Why is it like that ? The degree of undulation of the guide track, used to modulate the reflected phase of the laser beam with changes in amplitude, is 817.4 kHz for DVD+R discs. This makes it possible to encode a large amount of information, such as the address (location) of each sector or data relating to the writing strategy of a particular medium.
On the other hand, with DVD-R, the degree of undulation of the guide track, used to modulate the phase of the reflected laser beam with changes in amplitude, is 140.6 kHz for DVD-R (much less than in the case of DVD+R), which is a limiter to the number of bits recorded in this way. Therefore, after correct identification, additional information is required contained in the pre-pits located in the unused space of the medium. Addressing is thus limited to entire blocks only, preventing the use of Mount Rainier technology, among others. These factors make DVD+R discs have a slight technological advantage over DVD-R media.
It's so professional
Therefore ... above you have a clear interpretation and treat it as "secret knowledge"
It would be appropriate to mention that sometimes in older "burners" we can meet the problem that:
copied from disc to disc (all data) from DVD-R to DVD-R can be recorded, but not always to DVD+R (depends on the recorder). On the other hand, from a DVD+R carrier, you can copy the entire disc to any DVD disc - both + and -.
Despite the differences between the discs, you can successfully record on both types, with the fact that more speaks for the use of "+". However, due to the fact that older home theaters and various optical devices using older "-", as well as older recorders, do not allow themselves to be withdrawn from the production of "-" discs. Rather, the aim is to make the two standards interchangeable. This is why recorders are now compatible with discs and not vice versa :)
A complete innovation was the introduction of DVD-RAM
The DVD RAM disc works as a "large" disk memory, i.e. you can save/delete data on it using the copy/paste method. Exactly the same as with a pen-drive. Hence the name Ram because the disk acts as memory
