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Windows 10 64-bit: 1TB Invisible Disk Partition, Allocating Unallocated Space, Expand Volume Issue

poole18 10146 14
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  • #1 16793168
    poole18
    Level 7  
    Posts: 7
    Rate: 1
    Hello, my problem is that the newly purchased computer has a 1Tb disk and this capacity is visible in disk management but only 120 is allocated to partitions. How to allocate the rest of the disk or where is it visible? By clicking properties, the expand volume option is not available.
    Windows 10 64-bit: 1TB Invisible Disk Partition, Allocating Unallocated Space, Expand Volume Issue
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  • #2 16793178
    DriverMSG
    VIP Meritorious for electroda.pl  
    Posts: 44094
    Help: 3984
    Rate: 4833
    I see a partition over 900GB there.
    Show screen from the partition layout in DMDE.
  • #3 16793197
    conan02

    Level 30  
    Posts: 913
    Help: 174
    Rate: 91
    On the volume list at the top - 118.19GB. Windows 10 pre beta version continues.
    To the author: see in the disk properties (my computer) how much space you have on the C drive:
    It looks like a bugged disk management snap-in. Nothing new in the "ten".
    Company Account:
    Komputer Serwis
    Lwowska 147, Nowy Sącz, 33-300 | Tel.: 602-XXX-XXX (Show)
  • #4 16793225
    poole18
    Level 7  
    Posts: 7
    Rate: 1
    Windows 10 64-bit: 1TB Invisible Disk Partition, Allocating Unallocated Space, Expand Volume Issue
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  • #5 16793235
    DriverMSG
    VIP Meritorious for electroda.pl  
    Posts: 44094
    Help: 3984
    Rate: 4833
    Apparently there once was a 120 GB partition (maybe a cloned disk), anyway, these are just Windows anomalies.

    Do you have the option to connect this drive to another computer?
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  • #6 16793240
    poole18
    Level 7  
    Posts: 7
    Rate: 1
    C 118Gb disk capacity in properties
    Unfortunately, I can't connect it elsewhere.
    Windows 10 64-bit: 1TB Invisible Disk Partition, Allocating Unallocated Space, Expand Volume Issue
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  • #7 16793350
    conan02

    Level 30  
    Posts: 913
    Help: 174
    Rate: 91
    Advertise equipment. In fact, it looks like pre-cloning from a smaller medium and GPT groats have been made - 2 volumes are "Noname 2" - one 992GB invisible and the other 127GB separated on the first visible as a logical disk. You can't handle this configuration, because you would practically have to reinstall the system with disk repartitioning. Then the recovery partition goes into space. You can finally try to run system recovery, but I bet it will reconfigure as a 127GB system partition.
    Company Account:
    Komputer Serwis
    Lwowska 147, Nowy Sącz, 33-300 | Tel.: 602-XXX-XXX (Show)
  • #8 16793473
    DriverMSG
    VIP Meritorious for electroda.pl  
    Posts: 44094
    Help: 3984
    Rate: 4833
    poole18 wrote:
    Unfortunately, I can't connect it elsewhere.
    So further disk operations can only be done from the LiveCD system.
    You cannot perform operations on a system partition from the system booting from it.

    Show SMART disk yet.
  • #9 16793658
    poole18
    Level 7  
    Posts: 7
    Rate: 1
    Windows 10 64-bit: 1TB Invisible Disk Partition, Allocating Unallocated Space, Expand Volume Issue
  • #10 16793689
    DriverMSG
    VIP Meritorious for electroda.pl  
    Posts: 44094
    Help: 3984
    Rate: 4833
    Healthy disk. There are 2 options we have already written about:
    1 - warranty.
    2- bootable software.
  • #11 16793712
    poole18
    Level 7  
    Posts: 7
    Rate: 1
    What exactly is bootable software?
  • #12 16793719
    DriverMSG
    VIP Meritorious for electroda.pl  
    Posts: 44094
    Help: 3984
    Rate: 4833
    Software that runs from a pen drive, CDRom, other data carrier than your system / disk.
    Linux LiveCD, Gparted, Easeus etc.
  • #13 16794044
    mati211p
    HDD and data recovery specialist  
    Posts: 16915
    Help: 2584
    Rate: 1129
    According to me, I need to correct the partition table and extend the volume on the system or create a second data partition.
    PS $ Noname 02 is the same partition.
    $ Noname 02 BCF - valid partition.
    $ Noname 02 EBCF - damaged partition - incorrectly entered into the table.
  • #14 16794704
    poole18
    Level 7  
    Posts: 7
    Rate: 1
    So how to do it, I'm a bit green in it, I have only basic knowledge about computers?
  • #15 16796461
    poole18
    Level 7  
    Posts: 7
    Rate: 1
    I solved the problem by reinstalling the system.
    Best regards and thank you all for your help.
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Topic summary

✨ The discussion revolves around a user experiencing an issue with a newly purchased 1TB hard drive on a Windows 10 64-bit system, where only 120GB is allocated to partitions, leaving the rest invisible. Various responses suggest that this could be due to a previous partitioning anomaly or a bug in Windows 10's disk management. Recommendations include checking disk properties, using bootable software like Linux LiveCD or GParted for partition management, and potentially reinstalling the operating system to correct the partition table. The user ultimately resolved the issue by reinstalling the system.
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FAQ

TL;DR: On some Windows 10 PCs, over 900 GB on a 1 TB drive appears unusable; "You cannot perform operations on a system partition from the system booting from it." Use bootable tools or reinstall to reclaim space. [Elektroda, DriverMSG, post #16793473]

Why it matters: This FAQ helps Windows 10 users fix greyed‑out Extend Volume and recover missing disk space on new or cloned drives.

Quick-Facts

Quick Facts

Why is Extend Volume greyed out on my Windows 10 C: drive?

Windows blocks resizing the active system partition while it’s running. Boot from external media to manage it. “You cannot perform operations on a system partition from the system booting from it.” [Elektroda, DriverMSG, post #16793473]

Where did the missing space on my 1 TB drive go?

A large partition (over 900 GB) can exist but remain unusable from your current layout view. Tools can reveal it even if C: shows ~118 GB. [Elektroda, DriverMSG, post #16793178]

Is my hard drive failing or is it a partition problem?

SMART reported the disk as healthy. The problem stemmed from how partitions were created or cloned, not from hardware failure. [Elektroda, DriverMSG, post #16793689]

What caused only ~118 GB to be usable on a 1 TB disk?

The system appears cloned from a smaller drive, leaving a 127 GB system partition and messy GPT entries. That layout blocks expansion. [Elektroda, conan02, post #16793350]

What is bootable software and why do I need it?

It’s software that runs from a USB/CD instead of your system drive. “Software that runs from a pen drive, CDRom, other data carrier than your system/disk.” Use it to safely edit partitions. [Elektroda, DriverMSG, post #16793719]

How do I extend C: to use the unallocated space (three steps)?

  1. Create a bootable USB with a tool like GParted or EaseUS.
  2. Boot from the USB, then view the disk’s partition layout.
  3. Delete/merge stray entries if needed and extend C: into free space, then apply changes. “Linux LiveCD, Gparted, Easeus etc.” [Elektroda, DriverMSG, post #16793719]

Can I fix this without reinstalling Windows?

Yes, with bootable partition tools and care. However, the OP chose a full reinstall, which rebuilt partitions and restored capacity cleanly. [Elektroda, poole18, post #16796461]

What is DMDE, and why did someone ask for its layout view?

DMDE is a disk editor/recovery tool used to inspect detailed partition layouts. A layout screenshot helps experts pinpoint malformed entries. [Elektroda, DriverMSG, post #16793178]

What do “Noname 02 BCF” and “EBCF” entries mean?

They refer to partition records: BCF indicates a valid entry; EBCF indicates a damaged, incorrectly recorded one. Fixing the table restores access. [Elektroda, mati211p, post #16794044]

I can’t connect the drive to another PC—what now?

Boot from a LiveCD/USB on the same PC. You can then work on C: safely because it isn’t the running system. That enables extend/repair. [Elektroda, DriverMSG, post #16793473]

When should I use warranty service instead of DIY tools?

If the disk shows errors or you’re unsure, choose warranty. The expert outlined two tracks: warranty or bootable software. [Elektroda, DriverMSG, post #16793689]

Will trying to extend partitions risk data loss?

Yes. Missteps or rebuilds can remove recovery partitions and force reinstalls. One case reconfigured to a 127 GB system partition. Back up first. [Elektroda, conan02, post #16793350]

Why does Disk Management show 118.19 GB at the top but 1 TB at the bottom?

The volume list reports the active 118.19 GB partition, while the disk map shows total capacity. The snap-in display can mislead. [Elektroda, conan02, post #16793197]

Is a clean reinstall a valid fix for this layout?

Yes. A reinstall can wipe incorrect entries and rebuild GPT, reclaiming the full 1 TB. That’s how the OP resolved it. [Elektroda, poole18, post #16796461]

What’s the edge case I should watch for after recovery?

Recovery tools may recreate only a ~127 GB system partition, leaving the rest unused. Verify sizes before finishing. [Elektroda, conan02, post #16793350]
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