Windows 10: System (Z:) partition suddenly showing up on Win10 PCs

  1.    16 Apr 2016 #1

    System (Z:) partition suddenly showing up on Win10 PCs

    I'm seeing reports in other forums about folks suddenly having a 256MB FAT32 SYSTEM (Z partition appearing on their PCs!

    One person did mention they had used a VPN app (which might have created this), but none of the others have done anything like that.

    Anyone have any ideas we can investigate??
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  2.    16 Apr 2016 #2

    Z is usually a Virtual Disk
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  3.    16 Apr 2016 #3

    OK ... but folk are wondering how it got there (since they say they did nothing) and when they try to access is or remove it, they get permission denied!
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  4. Kari's Avatar
    Posts : 15,054
    Windows 10 Pro
       16 Apr 2016 #4

    Any links to these posts?
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  5. Berton's Avatar
    Posts : 5,416
    Win10 Home and Pro, Win10 Insider Preview, WinXP Home Premium, Linux Mint
       16 Apr 2016 #5

    By default Windows starts assigning the drive letter Z: to Networked drives such as a NAS/Network Attached Storage then works back up the alphabet for additional such drives. I have 2 NAS drives attached to my Router, first one was Z: and the second I added became Y:. All computers working through the Router can access the drives after they are Mapped.
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  6.    16 Apr 2016 #6

    Kari said: View Post
    Any links to these posts?
    There are others, but this is one I could find quickly:
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  7.    17 Apr 2016 #7

    Look at disk management and if it's not there it has to be some virtual or network drive. If it is a partition on disk, you can take it's letter off.
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  8. johngalt's Avatar
    Posts : 1,534
    WinX Pro x64 IP current
       17 Apr 2016 #8

    256 MB is a pretty small partition, if it is physical.
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  9.    17 Apr 2016 #9

    johngalt said: View Post
    256 MB is a pretty small partition, if it is physical.
    Had one of that size on my SSD and it was for GC and LL and at one time after an update it suddenly got a letter. It was made by program for updating FW on that SSD.
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  10. johngalt's Avatar
    Posts : 1,534
    WinX Pro x64 IP current
       17 Apr 2016 #10

    I know, but auto assigning it a drive letter with such small space is pretty ridiculous. Seems the firmware update package did not mark the partition correctly, as in making it active during reboot so it could flash the firmware, but then making it inactive again so that Windows would not detect it.
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