He Selected Volume or Partition is in Use O Continue With the Operation Use the Override Parameter

I'm trying to delete a partition on a UFD using Diskpart. I am running it through an elevated CMD prompt. But the problem is it reports that I am using an invalid argument. Please see the log below.

          Microsoft Windows [Version 6.3.9600] (c) 2013 Microsoft Corporation. All rights reserved.  C:\WINDOWS\system32>diskpart  Microsoft DiskPart version 6.3.9600  Copyright (C) 1999-2013 Microsoft Corporation. On computer: SKANNING24  DISKPART> list disk    Disk ###  Status         Size     Free     Dyn  Gpt   --------  -------------  -------  -------  ---  ---   Disk 0    Online          465 GB  1024 KB        *   Disk 1    Online         3819 MB  3670 MB        *  DISKPART> select disk 1  Disk 1 is now the selected disk.  DISKPART> list partition    Partition ###  Type              Size     Offset   -------------  ----------------  -------  -------   Partition 1    Primary             49 MB    64 KB   Partition 2    System              98 MB    51 MB  DISKPART> select partition 1  Partition 1 is now the selected partition.  DISKPART> list partition    Partition ###  Type              Size     Offset   -------------  ----------------  -------  ------- * Partition 1    Primary             49 MB    64 KB   Partition 2    System              98 MB    51 MB  DISKPART> delete  Microsoft DiskPart version 6.3.9600  DISK        - Delete a missing disk from the disk list. PARTITION   - Delete the selected partition. VOLUME      - Delete the selected volume.  DISKPART> delete partition 1  The arguments specified for this command are not valid. For more information on the command type: HELP DELETE PARTITION  DISKPART> list partition    Partition ###  Type              Size     Offset   -------------  ----------------  -------  ------- * Partition 1    Primary             49 MB    64 KB   Partition 2    System              98 MB    51 MB  DISKPART> select partition 2  Partition 2 is now the selected partition.  DISKPART> list partition    Partition ###  Type              Size     Offset   -------------  ----------------  -------  -------   Partition 1    Primary             49 MB    64 KB * Partition 2    System              98 MB    51 MB  DISKPART> delete partition 2  The arguments specified for this command are not valid. For more information on the command type: HELP DELETE PARTITION  DISKPART> help delete partition      Deletes the partition with focus.  Syntax:  DELETE PARTITION [NOERR] [OVERRIDE]      NOERR       For scripting only. When an error is encountered, DiskPart                 continues to process commands as if the error did not occur.                 Without the NOERR parameter, an error causes DiskPart to exit                 with an error code.      OVERRIDE    Enables DiskPart to delete any partition regardless of type.                 Typically, DiskPart only permits you to delete known data                 partitions.      You cannot delete the system partition, boot partition, or any partition     that contains the active paging file or crash dump (memory dump) filed.      A partition must be selected for this operation to succeed.      Partitions cannot be deleted from dynamic disks or created on dynamic     disks.  Example:      DELETE PARTITION  DISKPART> list partition    Partition ###  Type              Size     Offset   -------------  ----------------  -------  -------   Partition 1    Primary             49 MB    64 KB * Partition 2    System              98 MB    51 MB  DISKPART> delete partition 2 override  The arguments specified for this command are not valid. For more information on the command type: HELP DELETE PARTITION  DISKPART>                  

Q: What is the "argument" in this case? And why is it not valid?

This is not the first time that I'm using Diskpart, I have used it several times before whenever there were special hidden recovery partitions on a disk drive that could not be removed with conventional disk tools like Diskmgmt.msc. So I'm pretty sure I got the syntax right and I am doing everything according to the help pages.

I am working on Windows 8.1 and the UFD is a SanDisk Cruzer Blade 4 GB, brand new. I only had PassMark Memtest86 installed on it and that's about all I ever used it for. I have formatted the UFD today to remove Memtest86 from it (quick format in Explorer), but a hidden EFI partition was left on the UFD. See screenshot below.

danielsdiespone.blogspot.com

Source: https://superuser.com/questions/728486/cannot-delete-partition-in-diskpart-invalid-argument

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