Windows 10: inconsistent partition info in disk manager / diskpart

Hello Forum!

I hope I can find a guru here, who can explain the "interesting" phenomena of different partition types (in disk manager it's actually listed in the "status" column) being displayed by disk manager vs diskpart.

The setup: disk0 has 8 partitions (3 primary, 1 extended, 4 logical).

This is correctly shown by diskpart: partitions 1,2 and 3 are primary, partition 0 is extended, partitions 4,5,6 and 7 are logical drives within the extended partition.

Disk manager, on the other hand, lists 6 primary partitions (these are partitions 1,2,3,4,5 and 6 in diskpart) and one extended partition (probably partition 0, but smaller...) containing only one logical drive (partition 7).

The partitions I am actually trying to access are 4,5 and 6. They contain a linux installation, wich, oh wonder, i cannot access anymore after upgrading to windows 10. The entry in the bootmanager is still available, but it cannot find the linux boot manager anymore, which is located on partiton 5.

I used and still use the windows boot manager for the multiboot. Partitions 2 and 3 contain the windows 7 and 10 installs and work ok.

Just to clarify: this setup was working before upgrading to windows 10. I upgraded the windows 8.1 install in partition 3.

My intuition is that it must be related to the inconsistent display of the partitions in windows, since diskpart also lists partitions 4,5 and 6 as hidden.

So, any guru around?

Thank you in advance for enlighting info!

:)

 

COMPATABILITY

You could try diskpart to see if it’s listed there.

6. Open a Command Prompt W/ administration rights.

○ Type in "DiskPart" in command line.

○ Type in "list disk" in command line to show all disks in this machine.

○ Use "select" to set the focus to the specified partition.

For example "select disk 1".

○ Use "clean" command.

○ Use "Exit" to Close Disk Part.

1. Go back to Disk Management, you can see GPT disk is "Not Initialized" now.

2. Within Disk Management, right click on disk info, choose "Initialize Disk", You can see disk is "Unallocated" now.

3. Right click on disk info, choose "New Partition…", follow Partition Wizard and format it.

 

toshiba external hdd not recognized in windows 10

Under device manager is there anything with a yellow triangle?

Using command prompt>diskpart is the drive seen?

If so then you can use diskpart to clean the drive then it should be seen by disk management where you will be able to format it - choose MBR to have the drive compatible with previous Windows versions.

If there's something on the drive you wish to keep then plug it into another computer & save the contents.

• Type in "DiskPart" in command line.
• Type in "list disk" in command line to show all disks in this machine.
• Use "select" to set the focus to the specified partition.
  
  For example "select disk 1".
• Use "clean" command to remove GPT disk from the current in-focus disk by zeroing sectors.

• Go back to Disk Management, you can see GPT disk is "Not Initialized" now.
• Within Disk Management, right click on disk info, choose "Initialize Disk", You can see GPT disk is "Unallocated" now.
• Right click on disk info, choose "New Partition…", follow Partition Wizard and format it.

 

My guess is that the Linux logical partitions got corrupted by the Win10 installation. The Ubuntu forums has lots of posts from folks claiming their logical partitions got corrupted after a Windows upgrade.

If you have a live USB/CD, you could boot from that and run "fsck" on the partitions -- but don't be surprised if they are damaged.