Disk manager does not format partition after creation

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Disk manager does not format partition after creation

ooLi 0

Using disk manager assistant to create and format a new partition results in a partition with drive letter but a "RAW" filesystem.

It is possible to format the partition by calling the format dialog from disk manager context menu.

If I delete the partition and create it again. It ends up again created, with drive letter but unformatted/RAW

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Answer 1

Domic Vo 11,150 Independent Advisor

Hi ooLi,

I completely understand how confusing it can be when a newly created partition shows up as RAW, even though it has a drive letter. This usually means the formatting didn’t complete properly—often due to a system glitch, outdated drivers, or disk errors. The good news is your disk seems healthy since manual formatting works.

To fix and prevent this, I recommend manually formatting the partition after creation, running a quick disk check using chkdsk X: /f, and updating your storage drivers via Device Manager. For a clean setup, you can use Diskpart commands to create and format the partition reliably. Also, make sure your system is up to date by checking Windows Update, as Microsoft has released fixes for similar issues.

If Disk Management continues to misbehave, third-party tools like AOMEI Partition Assistant or MiniTool Partition Wizard can offer more stable results.

Let me know how it goes, and if this answer helps, feel free to hit “Accept Answer” so others can benefit too 😊

T&B,

Domic.

ooLi 0 Reputation points

2025-11-07T07:33:09.74+00:00

Thank you Domic. Actually my disk is OK, however the misbehavior of disk manager is reproducible.

It all starts that I have a diskpart script to format USB drives which I run for a decade on Win10 and all the sudden its causing problems with Windows 11. While testing the scirpt I noticed this disk manager behavior.

The script converts partitioning to GPT , create a small FAT32 and a large NTFS partition. Occasionally it succeeds but mostly not. Another script section would only create a single partition, which succeeds more often but also not reliable. The error is not consistent while creating two partitions. It varies, either the first or the second partition is formatted leaving the other RAW.

Furthermore the disk disappears after the failed format command and I have to remove and re-insert the USB stick that disk manager. That was never necessary in the past.

As background info I have to mention that I encounter this problem on a new computer with a clean Win11 (10.0.26100.1150) installation and my old machine where Win11 (10.0.26100.6584) was updated from Win10.

Possibly the introduction of the DevDrive option to format causing a different behavior.

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Disk manager does not format partition after creation

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