Can All Sonys Be Used In MSC?

[Vlad28]

Hi to all ! ( Im new here , recently joined ) I was looking into this forum many times and it really helped me , heres the thing , and hope you guys can help me whit this .. Im planning to buy a new Sony E. mp3,,.. (or maybe creative zen x-fi .. ) : since IM planning to buy in ebay ( I live in Argentina ) Im looking something between 50 to 100 .. and I saw some good ,nice Sony walkmans there .. some like : NWZ S544, S616F, E355 ,E436 ,.. regarding audio quality.. something to recommend?
and second.. The sony Walkman s .. can I use them like a flash -drive or pendrive ?
I work whit photoshop psd files.. I read that mp3 that can be used like pendrive must support ¨UMS, MSC¨ .. all sony mp3 can do this or some yes other no ?

best regards to all ..
Vladimir ( Buenos Aires . Argentina)