On 10/18/2015 03:56 PM, Paul Berger wrote:
It goes on to say that when the first read/write drive was developed (Igar) the hard sector holes where dropped in favour of more usable surface are. I have seen the diskettes for minnow and and they where considerably less floppy than the later diskette.
The Memorex 650 accommodated 64 tracks/cylinders instead of the later and more customary 77. It's worthwhile noting that the 651 implements FM on the drive--there's no "raw data" signal output.
It is hardly surprising that Memorex followed this scheme in those days they where famous poaching engineers and producing clones of IBM storage products. I remember a customer having a Memorex disk unit on a string of 3370s and I think you could have swapped parts between the Memorex unit and a 3370.
IBM occupied a large segment of the market and was a favorite target for lots of followers. If you just observe the passage of Memorex through the history of acquisitions and being acquired and sold, it's truly amazing that Memorex still exists--as a brand of Imation.
--Chuck
