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There is not enough usable free space on specified disk(s) to extend the volume.

We can run the following command to update disk information, it has the same function with the Rescan Disks in Disk Management:
1. Open Command Prompt under administrator. 2. Type: diskpart 3. At the DISKPART prompt, type: rescan

Reference: https://social.technet.microsoft.com/Forums/windows/en-US/f2dc07fc-3231-4ef5-8f9a-913b9b74a1a1/command-to-rescan-disks-in-disk-management-for-batch-file?forum=w7itprogeneral

How to extend the volume using command line.

Windows PowerShell
Copyright (C) 2009 Microsoft Corporation. All rights reserved.

PS C:\Windows\system32> diskmgmt.msc
PS C:\Windows\system32> diskpart

Microsoft DiskPart version 6.1.7601
Copyright (C) 1999-2008 Microsoft Corporation.
On computer: IN15INTMS001

DISKPART> list disk

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
  Disk 0    Online           50 GB  1024 KB

DISKPART> select disk 0

Disk 0 is now the selected disk.

DISKPART> extend

There is no volume selected.
Please select a volume and try again.

DISKPART> extend disk 0

There is no volume selected.
Please select a volume and try again.

DISKPART> list partition

  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
  Partition 1    Primary            100 MB  1024 KB
  Partition 2    Primary             49 GB   101 MB

DISKPART> select partition 2

Partition 2 is now the selected partition.

DISKP…