This is an authentic Hewlett-Packard 5MB flash disk and Stacker data compression software on 5 1/4" and 3 1/2" disks.  The flash disk has been tested to be error free using scandisk.  This disk can be used in both HP Omnibooks (300/600/800) and Palmtop machines (HP95LX/100LX/200LX).  Sold as is.