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Mac OS Clean Installation Guide
By Ron Wilder, Help & How-To

Learn how to upgrade your Mac OS

When you perform a normal system installation, the software modifies and updates the current folder containing the operating system. On the other hand, performing a clean install creates an entirely new system folder. It's important to note that a clean install doesn't replace the old system folder. Instead it disables it by renaming the folder Previous System Folder. If the installer did replace the system folder, you'd loose any third-party fonts or program additions (like extensions, control panels).

To perform a clean install, click on the Options button and activate the Perform Clean Installation check box. Then click the OK button and proceed as normal
Compatibility Issues

It's a given that as technology changes, companies will be forced to make the decisions as to whether to go forward and risk compatibility issues, or to grow stagnant. So don't let the number of issues listed below lead you to think that the new release is buggy. It's just that Apple's made certain sacrifices in compatibility to advance the OS. Besides, as you read on, you'll notice that most of the incompatibilities are minor or are being corrected by third party vendors as we speak.

The following is the list of some of the major issues that Apple engineers and late-beta testers have identified.

400K floppy disks If you have any of these rascals laying around you better transfer the data onto the hard drive before you install the upgrade. Mac OS 8.5 doesn't support the MFS disk format of the 400K disks and nor are there plans to support it in the future.

Finder and utility software Certain third-party applications that add features like change the way the menus work or how a file 's stored may not work. While most of the developers of these applications are busy updating the products you may be left with a file you can't open until they make the new release available.

QuickDraw GX Don't expect to be able to print anything using QuickDraw GX after you install the OS update. Changes made to the version of QuickDraw in the system will leave applications that use the typographical technology unable to print.

Accelerated NuBus Mac If you boosted your 6100, 7100, 8100, or 9150 PowerMac with a third-party accelerator the install application for Mac OS 8.5 will probably fail to install the system since it can't recognize your computer as a PowerMac.

Certain 5000 and 6000 series computers If you have a PowerMac 5200, 5300, 6200, or 6300 series computer you should first run the 5xxx/6xxx Tester utility before you attempt to install the upgrade. Apple's identified that these computers have a hardware problem that causes the computer to intermittently freeze. If the utility identifies a problem with your computer you should contact your local Apple reseller for details on fixing the machine. Otherwise, you can install the OS.

Virex and Norton's Anti-Virus It appears that these two applications, and possibly all other anti-virus software makes it impossible to copy to network servers or print documents. To solve the problem, remove the anti-virus extensions until a new version of the utility is available.

Virtual PC You'll need to upgrade to version 2.1 or later to run the application with Mac OS 8.5.

Iomega driver Version 6.0.1 of the Iomega Jaz and Zip driver won't work if you have virtual memory activated. To rectify the problem, upgrade to version 6.0.2.

AppleShare IP 6.0 This utility isn't compatible with the upgrade. Check the Apple Support page for news of a compatible version.

Can't Upgrade Your Disk Driver?

Each hard drive, regardless of the manufacturer, has a small section of low level drive support code at the beginning of the disk. It's here the disk gets disk support instructions to pass along to the computer.

Since Apple drives uses a slightly different set of instructions than third-party vendors, it's important that you update the driver using utilities provided by the manufacturer of the drive. Otherwise you could experience problems with drive, including loss of data.

In most cases you can use the Apple System Profiler (found in the Apple menu) to locate the manufacturer and the brand of the hard drive. Otherwise, simply pop the case off your Mac and do a little investigating.

Armed with the brand and model, simply go to the manufacturer's Web site and check on the driver information. Listed below are the names and Web locations of some of the major hard drive manufacturers.

Not Sure About Your Memory?
To find out about the amount of DRAM (or short-term memory) available to you, choose About This Computer from the Apple menu. In this window you'll see an item labeled Built-in Memory. If you have less than 16 MB, it's time to fork over some bucks to your friendly chip salesman.

To determine the amount of storage space you have on your computer click on the icon for the computer's hard drive. Then, choose Get Info command from the File menu. In the window that appears, you see a category for size. Remember, to play it safe you'll need at least 170 MB.


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