Help: How to reduce Disk size to erase and reinstall Mac #167

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2025-12-29T00:19:07+01:00

adam commented

2025-12-29 00:19:07 +01:00

Originally created by @manjotsidhu on GitHub (Apr 13, 2021).

Following the Post-boot instructions: https://github.com/sickcodes/Docker-OSX#additional-boot-instructions-for-when-you-are-creating-your-container. Erase button is disabled for me, and I don't know how to reduce the disk size. I tried Partitioning/Adding Volume but both failed showing me error message.

Originally created by @manjotsidhu on GitHub (Apr 13, 2021). Following the Post-boot instructions: https://github.com/sickcodes/Docker-OSX#additional-boot-instructions-for-when-you-are-creating-your-container. Erase button is disabled for me, and I don't know how to reduce the disk size. I tried Partitioning/Adding Volume but both failed showing me error message.

adam closed this issue

2025-12-29 00:19:07 +01:00

adam commented

2025-12-29 00:19:08 +01:00

@sickcodes commented on GitHub (Apr 13, 2021):

We are using qemu images so the disk dynamically changes size. You cannot change the size of the booted partition.

Boot into the Recovery mode.

Can you show screenshot of which stage you are at?

@sickcodes commented on GitHub (Apr 13, 2021): We are using qemu images so the disk dynamically changes size. You cannot change the size of the booted partition. Boot into the Recovery mode. Can you show screenshot of which stage you are at?

adam commented

2025-12-29 00:19:09 +01:00

@manjotsidhu commented on GitHub (Apr 14, 2021):

We are using qemu images so the disk dynamically changes size. You cannot change the size of the booted partition.

Boot into the Recovery mode.

Can you show screenshot of which stage you are at?

I have downloaded the prebuilt container and using the Container Creation Examples. I have successfully booted that container but since README also points to post-boot instructions. I am currently stuck there. I can see 3 partitions in my Disk Utility, 2 are 214GB in which I am not getting uninstall option.

Do I even have to follow that instruction or it would be fine without it ?

@manjotsidhu commented on GitHub (Apr 14, 2021): > We are using qemu images so the disk dynamically changes size. You cannot change the size of the booted partition. > > Boot into the Recovery mode. > > Can you show screenshot of which stage you are at? I have downloaded the prebuilt container and using the [Container Creation Examples](https://github.com/sickcodes/Docker-OSX#container-creation-examples). I have successfully booted that container but since README also points to post-boot instructions. I am currently stuck there. I can see 3 partitions in my Disk Utility, 2 are 214GB in which I am not getting uninstall option. Do I even have to follow that instruction or it would be fine without it ?

adam commented

2025-12-29 00:19:10 +01:00

@sickcodes commented on GitHub (Apr 15, 2021):

I would start a new container if you wanted to reinstall because the old one will grow very big.

If you want to remove the old one, you can use docker rm

@sickcodes commented on GitHub (Apr 15, 2021): I would start a new container if you wanted to reinstall because the old one will grow very big. If you want to remove the old one, you can use `docker rm`

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Reference: starred/Docker-OSX#167