Saves get corrupted + 320 gb on my ADATA 14 gb pendrive!?

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What steps will reproduce the problem?
1. When I stop playing paper mario and play other games (Mario sunshine , Star 
fox adventures) Paper mario's save gets corrupted and tells me to format the 
save. Or any other game. Randomly
2. I checked up on my pendrive and found out there was a folder named 
"found.000" I opened it and it had a copy of my configuration , games , 
controller and saves copied by like 40 times or 50. and the folder was at 320 
gb. But in my usb it showed that I only used 6/14 GB. I deleted everything from 
"found.000" And then every game I had saved went "corrupted"

What is the expected output? What do you see instead?
I lost a lot of time gaming. And I think I will use Nintendont again when this 
issue gets fixed. I'm a bit scared

What revision of Nintendont are you using? On what system Wii/Wii U?
Nintendo Wii 4.3 U R265

Please provide any additional information below.
My usb is: ADATA 14 GB
And my SD card is: Kingston 2 gb
I also used a pc controller to play the games
And had the option of saving "emulated memcard" and Multi memcard: Off - 251

Original issue reported on code.google.com by [email protected] on 5 Feb 2015 at 7:10