SSD Disk Capacity Listed As Unknown in Ubuntu

Summary: Learn about Ubuntu 24.04 showing disk capacity as Unknown with some SSD Drive brands.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

Affected Platforms:

  • Dell Pro 24 All-in-One Plus QB24250
  • Dell Pro 24 All-in-One QC24250
  • Dell Pro 24 All-in-One QC24251
  • Dell Pro Max 16 MC16250
  • Dell Pro Max 14 MC14250
  • Dell Pro Max 14 MC14255
  • Dell Pro Max 16 MC16255

Ubuntu 24.04 OS shows disk capacity as Unknown.
Disk Capacity Unknown

Steps to recreate issue:

  1. Boot to Ubuntu
  2. Put computer into suspend
  3. Resume from suspend
  4. Check the About page
  5. Disk Capacity shows as Unknown

Cause

When the computer resumes from suspend, reopen the setting page refreshes the capacity, because not all block objects are present at the time the drive size calculation is done.

Resolution

Workaround:

Use one of the below commands to get disk information:

  • Open Terminal (Ctrl + Alt + T)
    • Run one of the following commands:
      • sudo lshw -C disk
        Or,
      • sudo df -h
        Display Disk Capacity

Long-term fix:

Ubuntu plans to include the fix in the next Ubuntu release 26.04.

Affected Products

Dell Pro Max 14 MC14250, Dell Pro Max 16 MC16250, Dell Pro 24 All-in-One Plus QB24250, Dell Pro 24 All-in-One QC24250, Dell Pro 24 All-in-One QC24251

Products

Dell Pro Max 14 MC14255, Dell Pro Max 16 MC16255
Article Properties
Article Number: 000299042
Article Type: Solution
Last Modified: 22 Jul 2025
Version:  4
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