This auction is for a tested Teac FD-505 Combo 3.5" 5.25" 1.2MB Floppy Disk Drive.  I tested it for both reads and writes.  The 3.5 portion works flawlessly but I could not get the 5.25 to work.  It may have been the cable or jumper settings, I'm not sure how to use a drive like this.  Since I cannot verify the 5.25, this is sold as is.