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I am unable to create an extended partition on my disk in Gparted: the option is greyed out! I resized the primary partition on the disk to leave some unallocated space, and I wanted to make the extended partition there so I could make 3 logical partitions in there, but I can't.

I do not have any other extended partitions on the disk; the only other partition is the primary partition which I do not want to lose data from.

As you can see in this screenshot, the "Extended Partition" option is greyed out and cannot be selected.

Screenshot

Any help would be appreciated here! I apologise for the small text, it is because my laptop has a 1080p resolution, so the system is scaled for that.

EDIT 1: I believe the partition table is msdos (not 100% certain), I can only have 2 primary partitions maximum...

EDIT 2: Output of sudo fdisk -l /dev/sdb:

ubuntu@ubuntu:~$ sudo fdisk -l /dev/sdb
Disk /dev/sdb: 114.6 GiB, 123010547712 bytes, 240254976 sectors
Disk model: Ultra Fit       
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x73736572

Device     Boot      Start        End    Sectors   Size Id Type
/dev/sdb1       1920221984 3736432267 1816210284   866G 72 unknown
/dev/sdb2       1936028192 3889681299 1953653108 931.6G 6c unknown
/dev/sdb3                0          0          0     0B  0 Empty
/dev/sdb4         27722122   27722568        447 223.5K  0 Empty

Partition table entries are not in disk order.

(By the way, in this state there is only the 1 partition on the disk which is NTFS)

  • what kind of partition table is it? msdos? or gpt? gpt only has "primary" partitions, but as many as you want (not the limit of 4 in msdos partition tables -- extended partitions are a hack to get around that limitation). – cas Sep 29 '19 at 9:20
  • @cas - I believe msdos - I can only create 2 primary partitions – Daniel Massey Sep 29 '19 at 10:07
  • can you edit your question and post the output of sudo fdisk -l /dev/sdb? (not in a comment, that makes for an unreadable mess). – cas Sep 29 '19 at 11:14
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    If I were to guess, I'd say there is no partition table, because the "partition" is named /dev/sdb. What does it show if you enable "View -> Device Information" in the menu? – Freddy Sep 29 '19 at 11:19
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    You actually have a file-system on your device /dev/sdb. You do not even have a partition table and therefore cannot have partitions. @Freddy's comment should be the answer. – Hermann Sep 29 '19 at 14:02
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Like @Freddy stated in the comments, it seems there was no partition table at all on this disk. I have resolved this now by creating a partition table on the disk. Thanks for all your help anyway!

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