Have ordered the MS Pro Duo for Sony PSP mean. My first memory stick of SanDisk has served its purpose only partially. As with many other stock also with me the problem that I could load with the old no music on the PSP without the data corruption and error messages came. Often you'll hear the Scores of older games can no longer be loaded. But now with the original Sony gibts there no more problems. Here you really should buy a few more euros and invest an original if you want to have any trouble later. Especially since I have to say that the original Sony sticks to 4GB of Amazon not once are much more expensive.