Search results
Results from the WOW.Com Content Network
8-inch floppy disk, inserted in drive, (3½-inch floppy diskette, in front, shown for scale) 3½-inch, high-density floppy diskettes with adhesive labels affixed The first commercial floppy disks, developed in the late 1960s, were 8 inches (203.2 mm) in diameter; [4] [5] they became commercially available in 1971 as a component of IBM products and both drives and disks were then sold ...
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.
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 ...
And if you built a plane 20 or 30 or even 40 years ago, you would use a floppy disk to get information in and out of some of the avionics of that airplane."Persky sells about 500 disks a daybut ...
Single head drive, but double-sided floppy discs (total of 360 kB per floppy) Amstrad PCW8512/9512: 3 inch Double 2 80 9 512 720 kB 300 MFM 720 kB mode uses both sides - ensure disc inserted correct way up. Apple II: 5 1 ⁄ 4 inch Double 1 35 13 256 soft 113.75 kB 300 GCR [NB 2] 1 16 140 kB 3 1 ⁄ 2 inch Double 1 80 Variable (8-12) 512 400 kB
The first floppy disk was developed under the supervision of Alan Shugart in the late 1960s. The floppy disk was not introduced to the public until the 1970s by IBM. But, like any man-made product the floppy disk came with its pros and cons, such as it being cheap and portable while also having severely limited data storage. [citation needed]
For this reason, MFM disks are typically known as "double density", while the earlier FM became known as "single density". MFM is used with a data rate of 250–500 kbit/s (500–1000 kbit/s encoded) on industry-standard 5 + 1 ⁄ 4-inch and 3 + 1 ⁄ 2-inch ordinary and high-density floppy diskettes. MFM was also used in early hard disk ...
The SuperDisk's format was designed to supersede the floppy disk with its higher-capacity media that imitated the ubiquitous format with its own 120 MB (and later 240 MB) disk storage while the SuperDisk drive itself was backwards compatible with 1.44 MB and 720 KB floppy formats . Superdisk drives read and write faster to these sorts of disks ...