• Upgrade to macOS Big Sur. MacOS Big Sur elevates the most advanced desktop operating system in the world to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. Get even more transparency around your privacy.
• How do you upgrade the hard drive in the 'Original/Mid-2007,' 'Early 2008,' 'Early 2009' and 'Mid-2009' (20-Inch and 24-Inch) Aluminum iMac models? What type of hard drive do they support? Can you swap the hard drive for an SSD? Please note that this Q&A covers Aluminum iMac models with 20-Inch and 24-Inch displays.

27-inch iMac 3.2GHz Magic Trackpad; 16GB memory upgrade (two 8GB) 32GB memory upgrade (four 8GB) 3TB hard drive; 1TB or 3TB Fusion Drive; 768GB of flash storage; 3.4GHz quad-core Intel Core i7 (Turbo Boost up to 3.9GHz) with 8MB L3 cache; NVIDIA GeForce GTX 680MX graphics processor with 2GB of GDDR5 memory; iMac and the Environment. The new iMac ships with Mac OS X 10.4.10 Tiger and iLife ’08. This is the oldest iMac that supports OS X 10.8 Mountain Lion and later (OS X 10.9 Mavericks and later are free, and OS X 10.11 El Capitan is the last version supported).

Upgrade to macOS Big Sur

Before installing this upgrade, make sure that your Mac is ready.

Check compatibility

macOS Big Sur supports most Mac models introduced in 2013 and later.

View compatible Mac models

Make a backup

Before you upgrade, make a complete backup with Time Machine, or store your files in iCloud.

Learn how to back up your Mac

Free up space

If the installer needs more storage space to upgrade, you can free up space using tools that come with your Mac.

Free up storage space

Download macOS Big Sur

If you’re using macOS Mojave or later, choose Apple menu  > System Preferences, then click Software Update. If you’re using an earlier macOS, use the App Store instead.

Learn how to download and install macOS Big SurGo to the App Store

Get to know macOS Big Sur

Learn about some of the new features of macOS Big Sur.

Control Center

Control Center brings favorite controls such as Bluetooth, Wi-Fi, Do Not Disturb, and Sound together in a single place—so you can easily adjust them at any time.

Use Control Center

Notification Center

Notification Center puts notifications and>

Safari

Customize your start page, navigate with ease using the new tab bar, and access a new privacy report to see just how Safari protects your privacy as you browse.

Get to know Safari

Maps

Discover great places around the world and navigate easier with guides, cycling directions, indoor maps, Look Around, electric vehicle routing, and more.

Messages

Send messages to friends and family using new tools that make it easier to keep track of group conversations and give you fun, engaging ways to express yourself.

Use MessagesLearn more on YouTube

Photos

Use the expanded editing capabilities in Photos to easily make simple changes and more advanced adjustments to your photos.

Learn how to edit your photos

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Macos Upgrade To Catalina Not Big Sur

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