Recycle Export Problem

Im having a trouble with my Recycle...I just cut up some samples the other night and exported them as Wav's now just now I was cutting up a Jazz Sample and I exported as Wav. 24 bit. 44100 Sample Rate...Now do I need to format my USB drive to the MPC? or Do I need to do a basic format off my computer? Ive never had this problem before but when I press Load on the MPC and highlight the drive, and select it, the folder pops up where the samples are located and then when I enter the folder there are no samples there...Does anyone know whats going on? Ive done a full format on my USB drive and a Quick Format to no avail...