As I understand Muslim tradition, the words of the Koran were related to Muhammad from the angel Gabriel for over a period of some thirty years.
Many of these revelations are believed to be a few sentences but some revelations must have been paragraphs in length.
Because Muhammad was illiterate and he often received his revelations in the desert away from the company of others, he would have been unable to set up a system where he could immediately jot angel Gabriel's revelation to him on paper, prohibiting him from faithfully transmitting his received message without some margin of error.
For someone with a rather awful memory, I must at least admire Muhammad for his ability to correctly, and with 100% accuracy, repeat the revelations that were first transmitted to him.
So, my question is, for those who do not have a photographic memory, what would be the likelihood that they would be able to hear a sentence or paragraph or several paragraphs and transmit the message to another person to record (we must also consider that when Muhammad was in the desert and received a message, he must have taken a reasonably long time before reaching another Muslim, who was literate and had possession of writing materials) all of those hundreds of revelations for a period of some thirty years without a single omission, addition or other error on their part?
Should we then conclude Muhammad was gifted with a photographic memory if some analysis of this reveals the likelihood of 100% error free, faithful transmissions is absurdly low?