Copying Mac Disks with a Single Drive

10 Feb 2007

...
   What are the
dimensions of the different size heads?
  Not sure about dimensions- the 800/400k drives I think share common 
 dimensions with the PC-esque 720k drives, and the 1.4 SuperDrive is 
 known to be the same dimension as the 1.44 MB PC mechanism. 
And AFAIK all those heads are the same size. All those drives (Mac and 
PC) record 80 cylinders) at 135tpi. 

There is no problkem moving (720K) disks between 720K and 1.44M drives 
(there was moving 5.25" 360K disks between 360K and 1.2M drives because 
the former is a 40 cylinder unit, the latter an 80 cylinder one).

There were a few 40 cylinder (67.5 tpi) 3.5" drives, but AFAIK they were 
never standard on Macs or IBM PC compatibles.

-tony

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

Copying Mac Disks with a Single Drive