MacOS Catalina was the 16th major release for Apple's operating system. It included tons of new features, covering everything from iPad compatibility (Catalyst makes it easy to port iPad apps to Mac) to security (Gatekeeper will require Apple-notarized Developer ID for apps) to entertainment (new apps for Podcasts, TV, and Music), besides the usual improvements to all the native software. How much space do you need for Big Sur? While the installer for Big Sur takes up less than 16GB of space, you should make sure that you have at least 20GB of free space on your startup disk before you try to download and install it. The more free space, the better. The space on the HD that I had previously freed up suddenly was reflected. The HD-User volume had 43Gb free space. I was able to copy and delete files in Target mode without problem. Upon rebooting the Catalina Mac back to Catalina, the disk space was again reported as 5.1Gb free. This proves it is a bug in Catalina; the disk is operating properly.

Most of us are keen to update to a new version of macOS as soon as it is available. macOS Big Sur has been out since November 12, still, many users couldn't update their Macs straight away. It’s very frustrating if you see a message telling you that you don’t have enough space to install the new macOS. Don’t worry, though. There are lots of things you can do to fix it. We’ll show you what they are in this article.

How much space do you need for Big Sur?

While the installer for Big Sur takes up less than 16GB of space, you should make sure that you have at least 20GB of free space on your startup disk before you try to download and install it. The more free space, the better. Your Mac uses disk space to store temporary files and provide storage for active apps and tasks (which is what RAM does), so you should never be running with almost no disk space left.

CleanMyMac X makes it very easy to free up disk space on your Mac by identifying junk files and allowing you to get rid of them with a click. It can also detect large and old files and show you the files taking up most space and uninstall applications.

How to free up space for macOS Big Sur?

Complete the following steps to ensure your Mac is ready to update to Big Sur.

1. Backup your Mac

How Much Space Is Needed For Macos Catalina

Back up all files and data that are stored on your Mac. Preferably twice to different locations. While upgrading to Big Sur is safe, you never know when something might go wrong. If you use Time Machine or another backup tool, run a manual backup just before you upgrade. And, if you can, clone your startup disk to an external drive, too.

2. Free up disk space using CleanMyMac X

If you don’t already have CleanMyMac X installed, download it for free here. This tool will help you clear some space and delete large and old files quickly.

Launch CleanMyMac X.
Choose System Junk in the sidebar and press Scan.
When it’s finished, press Clean to free up space, or Review Details to find out more.

3. Get rid of large and old files

Media files usually gobble up a large amount of disk space. And the worst thing is they are scattered around Mac’s folders, making it difficult to find and remove them. CleanMyMac X proves to be useful here:

Choose Large & Old files in CleanMyMac X’s sidebar.
Press Scan.
When it’s finished, use the middle column to filter files by type.
Check files that you want to delete.
Press Remove.

4. Use Apple’s built-in storage management tool

Apple has provided a method for you to manage storage by showing you what is taking up disk space and making recommendations for deleting. It’s not as quick and easy as CleanMyMac X, but it can help you save disk space. Here’s how to use it.

Click on the Apple menu and choose About this Mac.
Select Storage and press Manage.
In the Recommendations section, review each section in turn.
Now go through each of the sections in the sidebar.
Delete files or take further action, depending on what you choose.

5. Delete local Time Machine snapshots

There is one other thing you can try if you keep getting a message telling you that you do not have enough space to install Big Sur. You should only try it if you are sure there is enough space on your startup disk and that the message is wrong. And it will only work if you use Time Machine to back up your Mac.

Time Machine stores local snapshots on your Mac. Your Mac is supposed to count the space used by snapshots as free space, which is why it looks like you have enough space for the installation.

However, it seems that the installer may not realize the space is free. The solution is to delete the snapshots. This won’t remove backups on your backup disk, just snapshots on your Mac.

Open Time Machine from System Preferences. Uncheck Back Up Automatically and wait some time till Time Machine deletes snapshots. Then you can turn Time Machine back on.

If you’re familiar with Terminal, you can try deleting local snapshots manually.

Go to Applications > Utilities and launch Terminal.
Type: tmutil listlocalsnapshots /
You will see a list of snapshots that look like this: com.apple.TimeMachine.2020-10–09-002010.local
To delete a snapshot, type: sudo tmutil deletelocalsnapshots
Then type the date part of the snapshot name. For example: sudo tmutil deletelocalsnapshots 2020-10–09-002010
Type Return and repeat for each snapshot you want to delete.

Hopefully, this helped you free up some space and update your Mac to the latest OS. If you're just preparing your Mac for the upgrade, don't forget to back up your data before you start clearing space. So you won't be afraid of losing anything important.

In Mac Catalina , How can I merge 2 internal partitions into one?

Under Partition tab , minus symbol (-) is disabled Châu thông phanhome.

and I have tried through Terminal by using below commands

diskutil list

diskutil mergePartitions JHFS+Mac disk1s5 disk1s7

I'm getting below error while running above commands

Any help Highly appreciated , Thank you in advance

Usage: diskutil mergePartitions [force] format name

DiskIdentifier|DeviceNode DiskIdentifier|DeviceNode

Merge two or more pre-existing partitions into one. The first disk parameter

is the starting partition; the second disk parameter is the ending partition;

this given range of two or more partitions will be merged into one.

All partitions in the range, except for the first one, must be unmountable.

All data on merged partitions other than the first will be lost; data on the

first partition will be lost as well if the 'force' argument is given.

If 'force' is not given, and the first partition has a resizable file system

(e.g. JHFS+), it will be grown in a is not given, and the first

partition is not resizable, you will be prompted if you want to erase.

However, if 'force' is given, the first partition is always formatted. You

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should do this if you wish to reformat to a new file system type.

How Much Space Is Needed For Macos Catalina Mac

Merged partitions are required to be ordered sequentially on disk.

See `diskutil list` for the actual on-disk ordering; BSD slice identifiers

may in certain circumstances not always be in numerical order but the

top-to-bottom order given by diskutil list is always the on-disk order.

Ownership of the affected disk is required.

Example: diskutil mergePartitions JHFS+ NewName disk3s4 disk3s7

This example will merge all partitions *BETWEEN* disk3s4 and disk3s7,

preserving data on disk3s4 but destroying data on disk3s5, disk3s6,

disk3s7 and any invisible free space partitions between those disks;