What's a Disk Image?

Thomas Thatcher ttha at uhura.cc.rochester.edu
Mon Oct 24 22:58:08 EST 1994

In <38fuu7$6j7 at mserv1.dl.ac.uk> nce at rri.sari.ac.uk (Nigel Eastmond) writes:

>Some archived material on yon Internet appears as what is known as a Disk
>Image.  What is that and how do you use it?

Hopefully you are a Mac person.  The principles of disk images are the same,
but I don't know how to use PC images.

A disk image is a file format for distributing software that preserves 
ALL the info present on the original disk.  For example, system disks
contain certain information in the boot blocks that is not preserved 
if you make a simple copy of the disk (which really only copies the 
visible files on the disk).

Apple has a disk image tool called DiskCopy 4.2.
Many Macintosh utility packages make their own disk images--in addition,
all support DiskCopy 4.2 images.  DiskCopy 4.2 is available free from
Apple's ftp site, ftp.support.apple.com, and probably also their WWW site
(http://www.support.apple.com, I think--don't promise)

Tom Thatcher
University of Rochester

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