![]() Few products in history have enjoyed such spectacular declines in cost and physical size along with equally dramatic improvements in capacity and performance. ![]() Disk drive performance and characteristics are measured by the same standards now as they were in the 1950s. The basic mechanical arrangement of hard disk drives has not changed since the IBM 1301. Both the hard disk drive (HDD) and floppy disk drive (FDD) were invented by IBM and as such IBM's employees were responsible for many of the innovations in these products and their technologies. Here's how to tell the difference on 5.25" disks.IBM manufactured magnetic disk storage devices from 1956 to 2003, when it sold its hard disk drive business to Hitachi. Here's how to tell the difference on 3.5" disks. When formatted for IBM, the disks are 360K. When used in connection with 5.25 inch floppy disks, the disk are 500K before the disk is formatted. When formatted for IBM, the disks are 720K. When used in connection with 3.5 inch floppy diskettes, the disk capacity is 1MB before the disk is formatted. Sometimes called MF2-DD or low density disks. DS/DD or MF2-DD "low density": The term DS/DD means double sided double density. When formatted for IBM, the disks are 1.2 MB. When used in connection with 5.25 inch floppy disks, the disk capacity is 1.4 MB before the disk is formatted. ![]() When formatted for IBM, the disks are 1.44 MB. When used in connection with 3.5 inch floppy diskettes, the disk capacity is 2.0 MB before the disk is formatted. DS/HD or MF2-HD "high density": The term DS/HD means double sided high density. We offer a wide variety of DS/HD and DS/DD floppy disks.
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