"La prelego estas sur la disko."

Translation: The lecture is on the disc.

[JamesBulls]

This sentence is all kinds of strange. As much as I understand it, "Sur" is for showing location: "on" or "upon." Is this saying that the lecture will occur with the speaker literally standing on a disk? I had the impression that if we wanted to say what the lecture was about, we should use "pri" or even "rilatas al," etc. Any thoughts?

[mihxal]

The lecture is recorded on the disk.

[CengalLut]

I understand that for optical discs, the data is etched on the surface, going all the way back to vinyls. Nevertheless, i feel that storage should always use "en" just for consistency with other forms of data storage. Changing the preposition based on physical mechanism makes it difficult and confusing for learners.

[JamesBulls]

That was not obvious from the context, so thanks for pointing that out.