[Coco] 1.2 MB Floppies (again)

[wdg3rd at comcast.net]

The word you're looking for is "coercivity" measured in oersted or ampere/meter units.

--
Ward Griffiths    wdg3rd at comcast.net

Men will never be free until the last king is strangled with the entrails of the last priest.  Denis Diderot

 -------------- Original message ----------------------
From: Gene Heskett <gene.heskett at verizon.net>

> The magnetic 'hardness' of the films on the 2 disks are different, the DD 
> type being easily written to, the HD type needing about 2x as much write 
> current.  One of the problems in useing the 3.5" drives today is that the 
> lower coercity film disks, labeled DD, are made out of pretty pure 
> unobtainium, and when you tape up the HD hole to make the drive thinks its  
> a DD disk, then the write current is turned down and the disk isn't 
> written hard enough.  It may read back in an hour, or maybe not.  In a 
> year, its generally no way Jose`.