GoTEK SFR1M44-U100...

Fred Cisin cisin at
Mon Jul 16 17:58:09 CDT 2018

>> On the Lisa "Twiggy" diskettes, they made special provision to get more
>> thumb prints.

On Mon, 16 Jul 2018, Eric Smith wrote:
> :-)
> I imagine you're aware of the actual reason for the two diametrically
> opposing jacket cutouts for the read/write heads.

I'm NOT sure.  I speculate:
1) for users who put it in the wrong way.  In which case, they should have 
had FOUR cutouts, AND a reversing motor and/or full track read and 
extraction to include upside down.  (there are EIGHT ways that a 5.25 will 
fit into the drive).
(cf. reasons for SINGLE button on Apple mouse)

2) To have two sets of heads.  Either performance, or simply two single 
sided heads, to have felt pad instead of head to head pressure

I am reminded of an episode of "Computer Bowl" (TV game show).  Nobody on 
Bill Gates' team could answer WHERE the write protect notch is on an 8 
inch diskette!

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