False Reading on "Get Info"

I've got 111 text files on the 2 GB drive (many are 30, 40 50 pages long, with a few pictures)and it will not let me store any additional files, saying it is full. But the Get Info on the drive shows 11.8 MB used, and 1.9 GB available.

OK, remember now, I'm new to this stuff. Explain Disk Utility - how do I get to it and what exactly do I do? Please lead me step by step. Thanks to all.

OK, thanks. Here's what I did:
On the left side bar was "1.9 GB SanDisk U3 Cruz"
Under it and offset slightly was "Sun Disk". On the first of those two, under the "erase" tab I was offered these options:
Mac OS extended (journaled)[+this was prechecked+]
Mac OS extended
Mac OS estended (case sensitive, journaled)
Mac OS extended (case sensitive)
MS-DOS file system
Unix file system
On the second of the two, under "erase", I was offered these options:
Mac OS extended (journaled)
Mac OS extended
Mac OS estended (case sensitive, journaled)
Mac OS extended (case sensitive)
MS-DOS file system
MS-DOS file system (fat16) [ prechecked]
Unix file system
The option with fat 16 looked the closest to what you recommended and it was prechecked, so I went with that. The drive was completely erased, showing 1.91 GB free space. I reloaded all the files I had mentioned earlier until I got the message that the drive was full. I checked it and was told that 13.2 MB were used, and 1.9 GB were free. Just as before. I still need help on this.

I get only one icon on the desk top. To tell you the truth it looks just like an external floppy drive I used to use on Windows, It's flat, rectangular, with a wide slot on one end. It's labeled "San Disk", but I think I remember relabeling the icon not long after i got my new Mac. I don't remember what the labeling was originally. But note this. I had heard that the U3 provisions were not compatible with the Mac system, so I deleted it from the drive to save space. All my text work has been in MS Word, so I use Parallels and XP. I go to XP to do all my text work. I don't have Word for Mac installed. The files I am trying to store on the flashdrive are on a CD-RW on which I tried to transfer files that were in My Documents. But they all came up Read Only. I didn't have a CD drive on my old Win98 unit so I don't have any experience with the CDs. So I said , Shoot, as cheap as flashdrives are, I'll just use that. Here's what Get Info said for the CD-RW when I inserted it on the Mac side:
Capacity - 182 MB
Available - Zero MB
Used - 182 MB
This doesn't make sense because a CD is supposed to have like 700 MB.
When I insert the CD on the XP side, under "Properties" I get:
Used - 1.31 MB
Free - 507 MB

I removed the U3 while on XP. I'm not sure it can be done on OS X. The U3 must be running in order to remove it as best I can remember from the instructions I got while Googling for them. I burned the CD while on Windows because that's where "My Documents" were. I haven't thought of copying the files to the desktop, but remember there are 111 of them. I might could gather them into a folder and then place the folder on the desktop. I need the files to be Archive rather than Read Only because I need to make periodic changes. It was always so convenient on my old Win98 to just park them in My Documents, but I needed back up from that. I was using Floppies for this on my old unit, and I'm trying to get away from that. Do you think the 182 MB is the actual size of the 111 files? Now that I think of it, I did have about a dozen Floppies. But if that's so, why did the 2 GB drive give the message of not allowing further loading? I really need to break away now; it's after 10:00pm here. But I would like to continue this thread.

I made two folders on the XP desk top and two on the OS X desktop - on each desktop, one from the Sandisk and one from the CD. (The two media are different sizes because I did not transfer all files on the CD to the Flashdrive. I ran out of room, or so I was told.)
On the XP desktop:
Folder from the CD - 48.1 MB
Folder from the Flashdrive - 11.2 MB
On the OS X desktop:
Folder from the CD - 48.5 MB
Folder from the Flashdrive - 11.1 MB

The Flashdrive shows 13 MB used, 1.9 GB free
The CD shows 182 MB capacity, 182 used, zero free

It seems to me that a 2 GB Flashdrive should have plenty of room left, but I get the message that it is full when I try to transfer additional files. It's all a mystery to me.