The file is a .S1A file, it isn't a wave or sample file. I can see the EX's HDD in My Computer but there is nothing in it! It only shows that the drive is 1G and use about 77MB, but I can't see any files or directories. I try to format the disk on my PC, and copy files to the HDD, but EX5 doesn't recognize the HDD until EX5 format it? Doesn't the EX's HDD using a FAT file system?