What is System data?

I was able to fix much of this using these steps that I received from the apple tech guy who walked me through this. It reduced my system data storage by 50%.

I hope it helps you all.

To find what is consuming this space, we can use these steps:

1. Open Finder and select the “Go” menu at the top of the screen. In the drop down,

select “Home”

2. With the Home folder option, switch to List View (Command-2) and open “Show View Options”

from the View menu (Command-J)

3. Place a check in the checkbox for “Calculate all sizes”. You should start seeing each

folder calculate the size in Finder. The bigger ones may take longer 

4. This will help you determine what folder is using the most data. Next, go back to

the “Go” menu in the menu bar at the top of the screen

5. With the “Go” menu open, hold the Option key down and click “Library” when it

appears

6. With the Library open, pull up the View Options menu (Command-J) and place a check

in the checkbox for “Calculate all sizes”. Check what is using the most space

and report it back. Application Support may be taking up a lot of space if

multiple 3rd party applications are installed.

7. Check each folder and subfolders within Users to see the culprit of what is using the

most Space.

Okay...this reduced my 150 gb of system data by 50%

After that, I downloaded malwarebytes.com the free version

I was able to reduce another 25% of the system data

I hope this helps.

I was able to fix much of this using these steps that I received from the apple tech guy who walked me through this. It reduced my system data storage by 50%.

I hope it helps you all.

To find what is consuming this space, we can use these steps:

1. Open Finder and select the “Go” menu at the top of the screen. In the drop down,

select “Home”

2. With the Home folder option, switch to List View (Command-2) and open “Show View Options”

from the View menu (Command-J)

3. Place a check in the checkbox for “Calculate all sizes”. You should start seeing each

folder calculate the size in Finder. The bigger ones may take longer 

4. This will help you determine what folder is using the most data. Next, go back to

the “Go” menu in the menu bar at the top of the screen

5. With the “Go” menu open, hold the Option key down and click “Library” when it

appears

6. With the Library open, pull up the View Options menu (Command-J) and place a check

in the checkbox for “Calculate all sizes”. Check what is using the most space

and report it back. Application Support may be taking up a lot of space if

multiple 3rd party applications are installed.

7. Check each folder and subfolders within Users to see the culprit of what is using the

most Space.

Okay...this reduced my 150 gb of system data by 50%

After that, I downloaded malwarebytes.com the free version

I was able to reduce another 25% of the system data

I hope this helps.

Mine take 150 g, I own Mac for 256 g, it's big problem for me! Anyone know how I can fix it?

It is the OS and other system services. How much space is it taking up?

Mine is showing 101GB of system data. I’ve never had this happen before

Since there is no Finder on an iPhone how were you able to do this?