Toraiz sp 16 keeps corrupting my usb drives and wont let me save samples

My sp 16 is refusing to save samples, this happened after I used usb mass storage mode to delete samples from the device. From that point on, it wont let me save samples to the toraiz, only on a usb drive connected to it. I am able to run usb mass storage but I am not able to open any of the files I see from my computer. and everytime I use a usb drive to save samples, I am not able to transfer them to my computer because they become corrupted.