Using a feature called Space Sharing, you can create multiple volumes within a container and share storage space automatically between them as needed.Īll you have to do is create a new volume, download the second macOS version to this location, and then choose the new volume when booting your computer. If you have macOS High Sierra (10.3) or later, then by default, your computer will use the APFS format required for this method to work. But that changed when Apple moved from a file system called Mac OS Extended to using the Apple File System (APFS).

In the past, installing two macOS versions on your Mac required creating a dedicated partition on your disk drive and allocating a set amount of storage space to it. Those iMacs without a back flap for a VGA external monitor will lose all access to the internal display if you attempt to install 10.2 or later without the firmware installed.APFS Makes It Easy to Install Multiple Versions of macOS Note, you can't install Mac OS X from 8.6, as the firmware will not have been applied. Be very careful not to insert anything meant for tray only drives if you don't have a tray drive. The drive may be cleaned with a slot loading cleaning brush CD that slides in. None of these discs should say upgrade, update, dropin, or OEM.ġ0.3.5 to 10.3.9 combo and 10.4.6 to 10.4.11 PowerPC combo can upgrade the respective CDs mentioned above once installed.ĭisks may be unreadable also because the PRAM/CMOS battery is not current, or dirt or dust has gotten on the disc or drive or the disc is scratched.

Tiger retail looks like and came in both multi-CD release and a single DVD release that only external Firewire drives could boot on the iMac G3, unless the iMac G3 has a built-in DVD reader. Once the correct firmware is applied, then you can install 10.3.5 retail or 10.4.6 retail: Also be sure that an authorized service tech has verified the PRAM/CMOS battery is current.Īnd should be installed first before the firmware is applied. If only the USB, ethernet, audio and modem ports are available it is compatible with 10.3.9 Panther.īefore you install anything, backup your data to two distinct locations.īefore installing any of the above, make sure you have the right firmware installed by installing the original Mac OS 9 retail installer disc. The two ports above the Y like logo on the left are 6 pin Firewire IEEE 1394a ports, and are the only external bootable Mac OS X ports on PowerPC Macs.

If all of the above ports are present, you are compatible with 10.4.11 Tiger.

Install mac os x 10.3 on pc without mac