How to Modify an OS X install disc to work on other computers.

One of the problems people have with older
macs is finding operating system discs. Its common for somebody to buy these gray versions
from places like eBay thinking they will work on their Mac only to try them out and get
a message like this. But I wanted to show you a way to bypass this
problem. You may need to use a different mac. Put in the disc you have and then open the
disc utility like this. Then select the DVD drive and click NEW IMAGE. Go ahead and save
it to your desktop. Also be sure to pick READ/WRITE for the image formt. This will copy the disk
to your desktop, and expect it to take a while. When it is finished, go ahead and eject the
real DVD from the drive. OK, now we need to find out your MACHINE ID.
The easiest way to do this is to go to the utilities folder and open a terminal. Type
in SYSCTL HW.MODEL. In my case the model is Macmini1,1. You may want to write this down
if yours is different. OK so go ahead and open the image and look
through the files. Scroll down and find the SYSTEM folder, then go into INSTALLATION,
then PACKAGES, then scroll down and find OSINSTALL. What you’ll need to do is RIGHT-CLICK or you
can also do a CONTROL-CLICK where you hold down control and click your mouse. Then select
SHOW PACKAGE CONTENTS. Next go into the CONTENTS folder and find OSINSTALL. You’ll need to
right-click this and select OPEN-WITH, OTHER, then locate TEXTEDIT. Now, what you are looking at here where it
says BAD MACHINES are computers which are specifically NOT allowed. Make sure your model
is not listed here. If it is, delete yours from the list. Next scroll all the way to
the bottom and find Supported Machines. You’ll need to add your machine in there. In this
case I’ll put Macmini1,1. You may need to unlock the file if it asks. You may want to
look through the file and see any other lists of machines and make sure to add yours to
the list. When you are all done, save the file. Next, dump the mounted image in the
trash, don’t worry this won’t delete anything. OK next find a suitable dual-layer blank DVD
and insert it. Now find the image on the desktop and right click and select open with disk
utility. Once it opens, select the image here, then click burn. Once it is done burning,
you have successfully created a replacement installer disc that should work with your
system. Now you can insert it into the machine you want to use it on, and it should work
just fine. OK, So I think I should point out one important
aspect of this little trick I’ve shown you. And that is, this is not going to help you
run an operating system on your computer that is flat out incompatible. It’s only really
going to help you in two scenarios. The first scenario is where you’ve bought a disc that’s
simply been coded for a different machine. For example you have a Mac Mini but you got
a restore disc for an iMac. And Apple for some reason or another made those discs so
that you couldn’t put them on one or the other even though there is really no technical reason
why they won’t work. The second scenario where this trick would be useful is there are some
computers where the operating system is actually known to be compatible but for some reason
Apple didn’t want to support it, and so they locked out certain older computers. But, you
know, if you see on the internet people saying, “well this operating system, even though it
isn’t officially supported, can be made to work,” Well then that is another scenario
where this little trick will help you. And so the reason I had to do this little
trick was because I wanted to answer a common question I get asked, which is about OS 10.4
Tiger. People want to know is it truly obsolete or is it still useful today? Well, I decided
I would try to make a video about that. First I had to find a copy of Tiger that would work
on an Intel machine because I wanted to run it on this Intel Mac Mini. And I couldn’t
find one. And so that’s why I had to do the trick. So yeah I’ll be showing you that video
probably here in just a few days. And in the meantime, leave me some comments and tell
me what you think about this trick!

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