[Android Q&A, Help & Troubleshooting] teknoplayer:
First of all, I'm sorry if a similar thread as already been made but i didn't find a section for my phone nor a thread about this type of problem. I found two threads on different forums with the same identical problem but the answers were bad or some times there wouldn't be any answers at all.

So, I got a Samsung Galaxy W this Christmas and I loved it, it was fast and smooth, and still is, but i noticed that it didn't come with a SD Card and i wanted one because i noticed an option to move my apps to the SD Card instead of having them installed in my phone memory.

So, yesterday i bought a 16GB SD Card, and plugged it in my Galaxy W. All fine, it appeared in the Storage Settings, i formatted it and everything was going well, but then i started moving my apps to it and first of all, I noticed that when clicking the Manage Applications option inside the Applications Settings, and then when i clicked the tab On SD Card, the space available wasn't 16GB (or 14,XXGB it doesn't matter) but some MB's (0,94GB used and 788MB free) and i started wondering, Where are my 16GB?. Later on i also noticed that 0,94GB + 0,788GB = 1,07GB which is my USB Storage capacity. So, why is my phone installing apps to the USB Storage instead of the SD Card. I also installed ES File Explorer from the Market and when i opened the app it showed me the content of the /sdcard, inside this there is a bunch of folders (Android, LOST.DIR, bluetooth, usbStorage, external_SD, etc...) and i found a folder called external_SD and i clicked on it and it opened the files of my SD Card the real 16GB one and i know this because i had plug my SD Card in my MacBook with the adapter that came it with and i dragged a movie and some music and it was there, inside that external_SD folder which is inside of the /sdcard location in my phone. What i understood from this is that my phone is recognizing the USB Storage as the SD Card even though that my SD Card is recognized as the SD Card in the Storage Settings. Also when i plug my phone to my MacBook via USB, two drives show up, a NO NAME which contains the files from the /sdcard/ and another NO NAME which is my 16GB SD card. I'm really confused with this and i really need to move my apps to the SD Card to save space. Please, what do i need to do to solve this problem?

I took some screenshots to help you understand the issue:

Settings>Storage:

Settings>Applications>Manage applications>On SD card:

You can see here that instead of showing the space available on my SD Card it shows the space available on the USB Storage.

More images, an example of what it looks like when i move an application to the "SD card":

Screenshots of what it looks like when i run a file explorer app, in this case, ES File Explorer:

And what's inside this strange external_sd folder inside /sdcard/ which are the files i have in my real 16GB sdcard:

A strange fact is that, when i unmount my SDCard on Settings>Storage>SD Card>Unmount and then try to access the apps or even move them to SD Card, the phone tells me that i don't have any SD Card mounted which is true. So the phone recognizes the SD Card but when the SD Card is mounted, the phone uses the USB Storage as the SD Card. This is what i think the phone is doing.

So please guys i need help. :(

NOTE: My phone is not rooted.