Mysterious drive Z: appears!

Hello every one, have a good day!
Here i come with my recent problem as in thread title.

Recently i found a Z: drive that i cannot acces or modify it in any way.
Here is some data that i gathered:

Code:

DISKPART> detail disk

Hitachi HTS541010A9E680
Disk ID: {C0F04480-1D8C-4C58-B5F0-FFA6AEEAD2BB}
Type   : RAID
Status : Online
Path   : 4
Target : 0
LUN ID : 0
Location Path : PCIROOT(0)#PCI(1F02)#RAID(P04T00L00)
Current Read-only State : No
Read-only  : No
Boot Disk  : No
Pagefile Disk  : No
Hibernation File Disk  : No
Crashdump Disk  : No
Clustered Disk  : No

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
  Volume 1     D                NTFS   Partition     90 GB  Healthy
  Volume 2     E   APPS         NTFS   Partition    195 GB  Healthy
  Volume 3     F   DATA         NTFS   Partition    644 GB  Healthy
  Volume 4         Odzyskiwani  NTFS   Partition    300 MB  Healthy    Hidden
* Volume 5     Z                FAT32  Partition    100 MB  Healthy    System

Code:

Microsoft Windows [Version 10.0.14393]
(c) 2016 Microsoft Corporation. All rights reserved.

C:\Windows\system32>takeown /F Z:\ /A /R /D Y
ERROR: The parameter is incorrect.

there is no security tab available neither that drive is listed in diskmgmt.msc.

Please help me to explain what this bizzare creation is and how to get rid of it.

Welcome to the forum that is the boot drive for your UEFI drive you should in assign the drive letter and don't touch it in any way or you won't boot it's normal but should be hidden

Ok, found this much since posted:

Any ideas how come it suddenly appeared?
What can I do to make it genuine hidden again?

HP Support Assistant creates this Z drive and it appears whenever I run "Check for updates and messages" It disappears after a restart. Nothing to worry about and lose sleep on it.

Continuing on the mysterious Z drive, it is found the HP Support Assistant gives the drive letter Z to the 260 MB EFI System Partition

AOMEI Backupper when No Z drive is created



AOMEI Backupper after HP Support Assistant created Z drive during the check for updates process. Note the 260MB EFI System Partition is now the Z drive.



It is also noted that when the Z drive is present Device Manager shows 8 WAN Miniports under Network Adapters.



Though there has been many queries on this Z drive in HP Support forum there is no official explanation on this. Some of the explanations given by HP Support Agents are found ridiculous.

Whatever, it is now proved beyond doubt that it is the EFI System Partition that takes on the Z drive letter and therefore no attempt should be made to delete it.

On my system, after closing the HP Support Assistant and restarting the notebook, the Z drive vanishes. This has been consistent.

However one should take care not to give drive letter Z to any mapped drive or any partition created that would clash with the Z drive created by HPSA.

I really have no idea of Avast connection with the Z drive but vaguely remember having read somewhere that there is an Avast connection though the Z drive is primarily created by HP Support Assistant. You may have to do more research on it :). I am only happy that the Z drive does not stick to my - rather my wife's - HP Notebook.Some of these problems can really make one go mad.