Answer:
Discs and the Internet are unreliable and often slow, and there's nothing quite as distracting as "having this issue" in the middle of a presentation.
Step-by-step explanation:
Presentation is often a formal talk or sharing of ideas about a topic which can be on any field, matter, discovery, product, to an audience.
Since discs are used for optical storage, which allows data storage and data retrieval are very good to store information for presentation.
However, discs can be unreliable likewise the internet. As a disc is a computer hardware, it can be attacked by a computer virus thereby affecting the stored data, and the internet speed also varies across locations, all these can cause distractions in the middle of a presentation especially if one needs the disc and the internet to be able to render a presentation efficiently.