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Drawings from IBM Floppy Disk Drive Patents. IBM's decision in the late 1960s to use semiconductor memory as the writeable control store for future systems and control units created a requirement for an inexpensive and reliable read only device and associated medium to store and ship the control store's microprogram and at system power on to load the microprogram into the control store.
IBM manufactured magnetic disk storage devices from 1956 to 2003, when it sold its hard disk drive business to Hitachi. [1] [2] 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. [3]
A Maxell-branded 3-inch Compact Floppy Disk. The floppy disk is a data storage and transfer medium that was ubiquitous from the mid-1970s well into the 2000s. [1] Besides the 3½-inch and 5¼-inch formats used in IBM PC compatible systems, or the 8-inch format that preceded them, many proprietary floppy disk formats were developed, either using a different disk design or special layout and ...
The standard floppy drive was upgraded to a 1.2 MB 5 + 1 ⁄ 4 inch floppy disk drive (15 sectors of 512 bytes, 80 tracks, two sides), which stored over three times as much data as the 360 KB PC floppy disk, but had compatibility problems with 360k disks (see Problems below). 3 + 1 ⁄ 2 inch floppy drives became available in later ATs ...
Zip drive (floppy-like, but incompatible medium using different technology) PocketZip (floppy-like, but incompatible medium using different technology) SuperDisk (floppy-like with drives also compatible with 3.5" floppy disks) Magneto-optical drive (floppy-like, but incompatible medium using different technology)
IBM 3740 Data Entry System was a data entry system that was announced by IBM in 1973. It recorded data on an 8" diskette, a new recording medium from IBM, for fast, flexible, efficient data entry to either high-production, centralized operations or to decentralized, remote operations. [1] The "Diskette" was more commonly known as an 8-inch ...
As a result, early floppy drives required jumpers to be set on the drive to tell it which controller commands it should receive. When introducing the PC, IBM sliced the cable between the first and second drive, and twisted seven of the conductors, effectively flipping the four conductors which specifically addressed the first or second drive.
According to Nakamatsu, IBM reached licensing agreements with him in the late 1970s. [3] [27] He also says to have licensed his floppy disk to IBM in 1979, [28] but that the details are "confidential". [6] An IBM spokesman, Mac Jeffery, confirmed that the company did license some of his patents, but said that they were not for the floppy disk ...