MBT to GPT format change


Hi, We have a 2TB volume m5.2xlarge instance, the root volume limit is 2TB and cannot increase the size because of size limit of it being MBR partion.

Model: Amazon Elastic Block Store (nvme) Disk /dev/nvme0n1: 2147GB Sector size (logical/physical): 512B/512B Partition Table: msdos Disk Flags:

The only way out seems https://aws.amazon.com/premiumsupport/knowledge-center/ec2-ubuntu-convert-mbr-to-gpt/ Is that the only way out here, is there a better way of increasing the limit without data loss?

asked 7 months ago64 views
1 Answer


There are many ways to prevent data loss that include the use of third-party software however a suggested method is using a gdisk tool.

Before altering any compute format changes, we highly recommend to deploy your snapshot, create an image from the snapshot and deploy into to a different Availability Zone to further increase availability and security of data.

According to volume requirements for Windows and Linux [1], the MBR default partition limits its max size to 2TB and does not allow any increases past this. We recommend creating a GPT formatted disk and copying over the data from the MBR. In the requirements there are steps outlined to create and copy data over from MBR to GPT. A suggested gdisk tool can be found here: Sourceforge GPT fdisk download [2].


1: volume-requirements

2: Sourceforge GPT fdisk

answered 4 months ago

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