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Help in identifying old floppy disk design

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krebizfan

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With all the discussion of old floppy designs, I was reminded of one I can't recognize.

The following image was on a site devoted to the Hungarian floppy of about 3" but this image shows 4 different floppies: the standard 3.5", the 3" commonly used by Amstrad, and the red labeled Hungarian design. But in the upper left is a floppy with bumps on either side of the back of the floppy. None of the floppy designs I remember or can find pictures of include that element. The front of the disk has the same style notches as the disk used in the Famicon. Anyone know what it is?

http://brg.8bit.hu/html/mcd1/pic/mcd119.jpg

Just in case anyone wants to stare at other pictures of Hungary's model floppy disk, go to http://brg.8bit.hu/html/mcd1/keptar.html

English language manual and some magazine articles (pricing is in the German magazine) are at: http://brg.8bit.hu/html/mcd1/dokumentumok.html
 
Ok, so you mean ths one. I've got a Smith-Corona PWP-2000 that uses these.

The Mitsumi drive is kind of interesting, with very few connecting wires. +5 power supply, ground, and motor control, raw read and write, and write-protect and a "start scan" signal wire. Pulse it and a clutch engages a cam on the spindle an the heads track a spiral around the disk then immediately return back to the start.

The PWP gets about 60K (IIRC) using MFM recording at a very leisurely 50KHz data clock. I built a rig to read these independently of the box they're in, using a 9914 data separator and 2650 USART (running in synchronous mode). Works like a champ.
 
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