![]() ![]() Then, open the Disk Tools folder on the CD and run the new version of Disk First Aid. Once you’ve made a complete backup, insert the installer CD and read carefully through the installation manual, the Before You Install file, and any other readme files. You should only install a new version of Mac OS on a fully healthy and backed-up Mac. Using the new Disk First Aid, check and repair disks.Read the installation guide and release notes.Also check tech notes in the Apple TIL, at / (now Apple’s Support Knowledgebase here) Checklist Further infoįull instructions are given in an Acrobat installation guide on the Mac OS 9.1 CD-ROM, with late-breaking news in the Before You Install file. You may also find extensions and applications that are incompatible with the new Mac OS. Installations can fail for many other reasons: if you have an older Mac OS on another volume, it will give you a fall-back whilst you sort the problem out. Make sure that you do not need to upgrade your Mac’s ROM (check Apple’s support site), and if you do, perform that first. Most problems arise when trying to install or update Mac OS on your only volume, hence it is better to have more than one volume available. Your Mac running at least Mac OS 8.1, the Mac OS 9.1 installation CD-ROM, one hard disk partitioned into 2 or more volumes, or 2 or more hard disks. ![]() You wish to install Mac OS 9.1 (or upgrade to it), and have more than one hard disk volume available. This is how we installed System 9.1 when it shipped in January 2001. However, we had to wait for 9.2 in June 2001 before enjoying significant improvements in performance, and Mac OS X 10.0 Cheetah wasn’t released until March 2001. Among the new features of 9.1 was support for the burning of CDs in the Finder, and Finder support for switching between open windows. Not only did Mac OS come on CD-ROM, but it was quite usual to install only selected parts of it. When you’ve updated Ventura, you’ll then have a useful comparison. To help you prepare for this, I thought it might be useful to revisit how we updated just over twenty years ago, to Mac OS 9.1, as we did in 2001. In the next day or three, Apple is expected to release the update to bring macOS Ventura to version 13.3. ![]()
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