1995 Sony Electronics, Inc. Sony Micro Floppy Disk/double Sided 10mfd-2hdcf 10 Pack Blister Box Package---capacity IBM Formatted 1.44 Mb 10 Pack---specifications Trackes Per Inch 135 Tpi, Number of Tracks-80/side Double Side/high Density---compatibility Is All Ibm-compatible 3.5" 2hd Drive Systems (I.e. Compaq, Dell, Hp, Gateway, Etc. ) and Laptops 10 Per Pack Made by Sony HD Disks 3.5 inch Blister Package