[Solved] What is Z drive?

Discussion in 'Windows 10' started by Katzenfreund, Aug 2, 2016.

  1. Katzenfreund

    Katzenfreund MDL Expert

    Jul 15, 2016
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  2. ofernandofilo

    ofernandofilo MDL Member

    Sep 26, 2015
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    #2 ofernandofilo, Aug 2, 2016
    Last edited by a moderator: Apr 20, 2017
    Probably because you tried to run a batch file in a shared folder on the network.

    If I'm not mistaken there are some commands that force a net use that will generate by default drive Z:.

    Try if you wanna get rid of that:
    Code:
    
    net use /delete Z: & REM If this is a network folder
    subst Z: /D & REM If this is a folder remapped
    
    cheers
     
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  3. MrMagic

    MrMagic MDL Guru

    Feb 13, 2012
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    Vaguely remember Office doing that years ago
     
  4. crexis

    crexis MDL Novice

    Mar 22, 2013
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    I believe that's your system's reserved space. You shouldn't be able to see it, since windows usually don't assign driver letter (Z: ) to it. Not sure for all of its functions, but one of them is keeping info for your encrypted drive in case you are using an encryption. If you want to get rid of it, just open DiskManager and remove the letter Z: from the said 350mb partition, click ok and you wont see it again in Explorer.
     
  5. TrustMe

    TrustMe MDL Member

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    #5 TrustMe, Aug 2, 2016
    Last edited: Aug 2, 2016
    Maybe Windows assigned a drive letter to your System Reserved Partition, it's where your boot files are stored. Take a look in Disk Management.
     
  6. PhaseDoubt

    PhaseDoubt MDL Expert

    Dec 24, 2011
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    This. If it bothers you go into Disk Management and remove the drive letter and it will no longer be visible. Understand that's remove the assigned drive letter, NOT the drive or partition.
     
  7. Comandante Kraang

    Comandante Kraang MDL Novice

    Aug 2, 2016
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    Is the best Windows of the history
     
  8. PhaseDoubt

    PhaseDoubt MDL Expert

    Dec 24, 2011
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    Best? That's mostly a matter of opinion. I'll reserve judgement for "best" after the anniversary update is installed on our computers. Now, if you're a boating buddy of mine, Windows 10 is the worst thing since ME. It all just depends, and as is the usual case YMMV.
     
  9. Katzenfreund

    Katzenfreund MDL Expert

    Jul 15, 2016
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    Thanks for the replies so far.

    Though generally informative, they don’t seem to address the issues:

    Those who advise me to deal with it in Disc Management, should note my statement in my OP that drive Z is not shown in Disc Management.

    @ ofernandofilo
    I have not tried to run a batch file in a shared folder on the network.
    @ MrMagic
    To the suggestion about Office doing it, I clarify that I’ve only installed Word and no other Office apps.
    @ crexis
    I am not using an encrypted drive. And I cannot see drive Z in Disc Management.
    @ TrustMe & PhaseDoubt
    As I said, I cannot see drive Z in Disc Management. The suggestion about boot files being stored there seems interesting in view of the file system being FAT32, where would I find those? Shouldn’t they be normally hidden?

    Finally, there is the fact that it wasn’t there (visible) before and now it is.

    I clarify that I’m not so bothered about leaving it there, as long as I know what it is and why it suddenly appeared.
     
  10. Tito

    Tito Super Mod / Adviser
    Staff Member

    Nov 30, 2009
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    #10 Tito, Aug 2, 2016
    Last edited by a moderator: Apr 20, 2017
    @Katzenfreund

    Can you please attach the output of the following:
    Code:
    diskpart
    select disk 0
    list volume
    
    Looks like the the EFI boot system partition is somehow assigned a drive letter.
     
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  11. 100

    100 MDL Expert

    May 17, 2011
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    #11 100, Aug 2, 2016
    Last edited by a moderator: Apr 20, 2017
  12. Katzenfreund

    Katzenfreund MDL Expert

    Jul 15, 2016
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    Excellent 100, you get 100 out of 100! :)

    TrustMe & PhaseDoubt were also of course correct in saying that boot files are stored there.

    There only remains my curiosity why it suddenly appeared.
     
  13. Leslie_Coffelt

    Leslie_Coffelt MDL Member

    Feb 6, 2014
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    Perhaps it is Z last drive you will ever need.
     
  14. MrMagic

    MrMagic MDL Guru

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    Knowing MS there will be a Z.3. Z.5. Z.10
     
  15. Katzenfreund

    Katzenfreund MDL Expert

    Jul 15, 2016
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    Like I said repeatedly, partition Z didn't appear in DM, there was no Z mentioned there, otherwise I wouldn't have posted the question.

    EFI does show, but without a letter, without mention of FAT32 and with a size of 360 MB instead of the 256 MB of partition Z. Close, but not the same. MS are experts at creating confusion with simple things. And unfortunately they seem to catch me out every time.

    And a new development, which is the cause of this post. Though I did not delete Z yesterday, today after the anniversary update it's gone of its own. The reason I can think of for the disappearance is that...err...since the mystery was solved, MS no longer had a reason to show it there.
     
  16. RobertJ

    RobertJ MDL Senior Member

    Apr 4, 2014
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    Yes, I got that. :rolleyes: But when you agreed with 100's assessment that it was the ESP that suddenly showed up, my point was that if it truly was the ESP, it ought to have been visible in Disk Mgmt. as well. Since this partition doesn't, I'm still confused as to what it is.

    I suppose you could use a utility that tells you what partition type ID it is precisely, but since it's gone from view now perhaps you're not interested.
     
  17. 100

    100 MDL Expert

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    #18 100, Aug 3, 2016
    Last edited by a moderator: Apr 20, 2017
    Odd. So if diskpart showed Z: as ESP, and disk management shows another one... I suppose it's possible that you somehow ended up with two ESPs. :confused:

    Disk management can't really be trusted since it doesn't show hidden partitions.

    Here's how to do it in PowerShell:
    Code:
    Get-Partition | select DiskNumber, PartitionNumber, DriveLetter, Size, GptType | ft
    The type GUID for ESP is {c12a7328-f81f-11d2-ba4b-00a0c93ec93b}.
     
  18. T-S

    T-S MDL Guru

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    Just open the disk management utility and remove the unneded drive letters, two mouse clicks.

    No need for obscure powershell commands.
     
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  19. T-S

    T-S MDL Guru

    Dec 14, 2012
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    Office starter uses a virtual drive, but it calls it Q, not Z.

    For the record it still works perfectly on W10 anniversary (it needs an update)
     
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