Mac os resize partition without losing data

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Related 3. The process involves creating an image of the partition for safe keeping, deleting the original Bootcamp partition with Disk Utility, creating a new, more expansive partition, and then moving the data from the imaged partition to the new one with WinClone.

Although this method is capable enough to enlarge your Bootcamp partition size, you have to delete Windows at first. Click to tweet. Step 2: Use Disk Utility to shrink your Mac partition to release some unallocated space as much as you need to add to the Bootcamp partition. Step 4: Download MiniTool Partition Wizard Free edition from its official website, install it on your computer according to prompts and then launch it to get its main interface.

Add, Delete, and Resize a Mac Drive Without Formatting

Step 5: Step 6: Choose the unallocated space from the Take Free Space from and then drag the sliding button to decide how much free space to take. Step 7: You will be asked to restart your computer to apply the task since the Bootcamp partition is being used now by Windows.

After all operations done, you have finished increasing the size of Bootcamp partition without deleting Windows. Video tutorial for resizing your Bootcamp partition without deleting Windows disk partitioning.

Resize a Volume Without Losing Any Data

In addition to extending partition without data loss, MiniTool Partition Wizard can also help to shrink the size of Bootcamp partition. But, how do I reduce the size of a bootcamp partition? Keep reading to find details!


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  • Resize Partitions in Mac OS X with Disk Utility.

Step 3: Change the length of partition handle to resize partition. This somewhat complex example turns out to be a good model for the type of resizing commonly performed. It also includes many of the resizing rules, and requires moving data around, deleting partitions, expanding partitions, and recreating a previous partition that is smaller than it used to be.

Select the disk not the individual volumes in order for the Partition button to become available.

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In the Disk Utility sidebar, select the disk associated with the three partitions. Select the iTunes partition by clicking once within it. The partition should be highlighted, and the Partition information panel will contain data about the selected partition. To make room for a larger Home Videos partition, the iTunes partition will need to be deleted. With the partition selected, click the minus button - to delete the partition.

How to Resize a Mac Volume With Disk Utility

The rules require the partition behind the one you wish to enlarge to be deleted to allow for the enlargement of the partition. The partition map will display the anticipated results; in this case, the iTunes partition is removed, and its space is assigned to the Home Videos partition.

With the iTunes partition removed, the Home Videos partition increases to take over the freed up space. Or, you could resize the now larger Home Videos partition to make it a bit smaller, and create an additional but smaller partition for the iTunes Library. Select the Home Videos partition, and then change the value in the Size field to a new smaller value.


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In my example, the Home Videos partition ended up being GB, but GB would be more than large enough, and would leave enough space left over for the iTunes partition. Your numbers may vary, depending on the sizes of your drive and partitions. Enter GB in the Size field, and then hit the tab key for the Partition map to show the expected results.

How to expand Macintosh HD partition without losing data?

Reducing the size of Home Videos partition caused a new untitled partition to be created just behind the Home Videos partition. The rules state that when you reduce the size of a partition, a new partition is created with the space you freed up. Notice you now have an Untitled partition you can use for iTunes, and you also have a resize control small white circle on the partition map that you can use to adjust the size of the new Untitled partition, and the Home Videos partition.