Quote:
Originally Posted by tc95 BUZZ...!!! WRONG...!!! The original floppy disk was created in the 1960's which was an 8" floppy disk...which became commercially available in the 70-71...by 1976-78 the 5 1/4 disks were introduced because they were easiser to carry and were not as fragile as the 8" disks...
Hope that helps out....  |
it was the early 80s before 5.25 became widely used in commercial equipment. They replaced 8" because while smaller, they could hold more data but the physical contruction was almost identical; both were 'floppy' unlike the later hardcased 3.5" diskettes. The 5.25 didn't take off until they could surpass the existing 8" in capacity, and IIRC that wasn't until they had a DSDD version to supplant the DSDD 8".
We built 8" drives from before I started in 1977 thru the mid 80s, at 1st they were single sided and single density, when we stopped making them we had taken them to double sided and double density (DSDD). Our drive was originally licensed from Shugart, but we reverse engineered around the patents and designed the double head version ourselves. The upper head mounting was particularly tricky.
At one point we had some issues with the upper gimbal-mounted head resonating and literally scraping the oxide off the discs. We came up with fix that involved .1 sqin pieces of latex as a dampener. I bought a single box of latex surgical gloves at the local drugstore and they were enough to rework 1000s of drives!
I can still remember when my boss showed me a Mitsubishi (or was it Matsush*ita?) 5.25 and we fully understood the sand was running out in the 8's hourglass (I was working in our Ft Worth factory, and I was there only in 1983-84, that's how I remember!). Until then I pretty much knew more about the manufacture of the 8" than anyone in the world outside Shugart. I decided then and there that being an expert was a fleeting proposition, and that being flexible was a better career path.