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I use a 525 GB drive that's dual booted with Ubuntu 18.10 and Windows 10. My Windows partition should be 425 GB and my Ubuntu partition should be 100 GB, but I see two non-NTFS entries:

  • One says Extended (Contents: Extended)
  • One says Linux (Contents: Ext4)

Both volumes say 100 GB, so I am confused what the difference between the two are. I'm thinking they can't be independent volumes, since then the numbers wouldn't add up to 525 GB.

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    Possible: askubuntu.com/questions/151968/… You are seeing an Extended Partition with a Logical Partition (ext4) contained within. It is not a duplicate partition but a container type to extend beyond the 4 Primary Partition limit of a MBR partitioning scheme. – Terrance Mar 10 '19 at 5:29
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@Terrance. Thank you, that gave me the information I was looking for.

An extended partition is a special container type that allows for more partitions than the maximum four allowed by a traditional partition table. It can hold multiple logical partitions. An operating system (such as Ubuntu) can be installed on either a primary or logical partition.

This installation just created an extended partition and installed on a logical partition, to allow for future partitioning if needed.

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