[Samsung Galaxy S Blaze 4G] Cirkustanz:
"A couple videos" was probably the culprit, as they tend to be big files of course.

About moving the apps to the sd card....allow me comment on that, and then rant a little bit.

Many apps can be moved to the sd card. If it's enabled by the app, you can just go to settings, applications, manage applications or whatever, and select the application you want, and in the same screen where you can uninstall an app, some apps let you move them to the sd card. Not every allows this, and in general, if you have an app with a widget on the sd card, it either won't work, or something weird happens. (Android designed limitation with widgets)

Now, to my rant.

My first android phone was a nexus 1. Great phone, but compared to a lot of phones it has a small amount of program memory. So if people were prone to having lots of apps especially large ones such as google earth, java, or whatever, that space filled up quick.

I think it was around 2.2 when Android started opening up moving apps to the sd card.

To this DAY, you can go into the market comments and pretty much read moron after moron doing things like, "I rated this a 1, because I can't move it to the sd card! Gah, you suck, let me move this to the sd card!"

Some times they would have a point, but more often than not, they wouldn't.

For example, this app that was 25k in size, had 15 comments in a row about people whining to move it to the sd card. SERIOUSLY? 25k is NOTHING, even to a phone with limited memory such as a nexus one.

And then there would be people whining about apps on SD cards for apps that you SHOULD NOT put on an sd card. "What apps wouldn't you want to run on an sd card?", you might ask.

Any app that should be always running, or able to be run by some event changing, while your phone is plugged into the computer.

For example....let's say you have a call blocking app. There are a few, I use one myself. If you move it to the sd card, that app can not function if the sd card is mounted to the computer. Phones mount memory cards just like computers do, and if it's unplugged......it doesn't work! So if you have the card mounted in the computer and your phone rings....guess what, your call blocking app doesn't work, and that annoying jerk is making your phone ring again.

Somewhere, a kitten dies.

I used the call blocking app as an example as something that even though it's not doing anything most of the time, but that when another event happens (your phone ringing), it can't do it's function.

I used to know why widgets on the sd card didn't work, but I suspect it has something to do with just they can't work reliably on the sd card. For example, my preferred music player poweramp, can be moved to the sd card, and of course it has widgets. So.....the dev made an add-on you can download where the widget stays on the phone, the app goes to the sd card.

Personally, I just keep poweramp on the phone memory. Since it's one of my 5 most commonly used apps, it only makes sense, right?

I can't remember if flash for browsers is able to be moved to the sd card yet, but what I do know is people whined and whined and whined about it, not realizing that.........the browser wouldn't work very well if flash was installed to the sd card.

Titaniumbackup and probably other similar apps can force apps to the sd card that are not normally allowed, but they will of course caution you about doing it. Some of that caution verbiage is there for reasons which are in this post, and I'm sure there's other concerns as well.

Moving along to your last question...... that depends.

Some apps can be configured to have a preferred directory location for storage, but realize that there are still phones out there that either don't have memory card slots, or don't have "usb storage". As a result, sometimes it works easily, sometimes it doesn't, but most file explorer apps make moving stuff around pretty easy.

Personally, I'm not really sure what the point of having both is, but it seems to be common. All I know is that having a memory card slot is a good thing. There are a few reasons why I wish I would have just bought a google nexus, but...... odds are the 64gig microsdxc cards work in this phone, and well, I plan to buy one.

Sorry nexus, you're hot.....but having 4 times the music or video on hand, is something I think I would enjoy more.