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HDD 3 TB with GPT not possible to change from primary to logic volume

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In DD 12

this option is lacking in case of a seagate barracuda 3 TB, which was initialised by windows 7 with GPT and as a primary volume /partition.

Is this in principle not possible to change a GPT HDD from primary to logic or vice versa ??

This HDD is an external media, not a system media which needs to be bootable.

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SurgeonX1:

Primary and logical partitions are only available on MBR disks. The GPT partitioning scheme allows for a very large number of partitions, so there is no need to have logical partitions. Limits are imposed by operating systems. For example, Windows has a limit of 128 partitions on a GPT disk.

Mark Wharton wrote:

SurgeonX1:

Primary and logical partitions are only available on MBR disks. The GPT partitioning scheme allows for a very large number of partitions, so there is no need to have logical partitions. Limits are imposed by operating systems. For example, Windows has a limit of 128 partitions on a GPT disk.

 

Thanks, this is right.

I asked this in other places, only rare people seem to know this in detail.