Alright, I was trying to teach this woman how to post in a forum (she's computer illiterate), and she refused to word it as I advised, which is what led to your confusion. Of course, now that she knows HOW TO post, I guess I can take it from here.
I'm looking for a video MP3 so that I can download videos to it and show them to people whenever a computer is not available or convenient, rather than asking for their email and sending them the link later (or, maybe, they don't have very fast Internet, so the videos take forever to load). However, I don't want to ever have to delete a video, in case I want to show it to someone, but I deleted it. The only way to guarantee that I never run out of storage space like that is to have ugradable storage, a la an SD card.
So, when I'm shopping around, specifically, what spec tells me that the storage is upgradable like this? And how do I narrow the search so that only MP3s that meet that spec are listed?
Is that a bit more clear than what my mother asked you?