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[Solved] Lenovo Legion Y520 100% Disk Usage Issue: 1TB HDD, Startup Parameters & Potential Damage

KamilTiVis 9495 12
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  • #1 17038369
    KamilTiVis
    Level 8  
    Hello, I have a problem, for some time my laptop in Lenovo Legion Y520 laptop has 100% disk usage all the time. I even returned to the startup parameters, i.e. reinstall was, despite this, nothing helped and is it a damaged disk?
    1TB hdd disk
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  • #2 17038376
    jdubowski
    Tube devices specialist  
    KamilTiVis wrote:
    The disk drive in the Lenovo Legion y520 laptop has 100% wear at all times.

    Wear?
    Does it use 100% or is it 100% filled with data?
    KamilTiVis wrote:
    I even recovered to the startup parameters, i.e. reinstall was,

    Have all the necessary drivers (especially the chipset driver) been installed?
    KamilTiVis wrote:
    Is this a damaged disk?

    Show SMART this disk ...
  • #3 17038409
    KamilTiVis
    Level 8  
    It has 100% use and drivers are uploaded. I will give a smart disk as soon as I get home + I do not know if I added it, but before the reinstallation it happened overnight, the computer began to get stuck and then I discovered it, that's why I did the reinstallation
  • #4 17038448
    Kolobos
    IT specialist  
    Use Process Explorer from MS, enable showing column for writing to disk and place screen of the whole window from the program.
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  • #5 17039507
    KamilTiVis
    Level 8  
    Lenovo Legion Y520 100% Disk Usage Issue: 1TB HDD, Startup Parameters & Potential Damage

    Please.

    Added after 25 [minutes]:

    And smart here! Lenovo Legion Y520 100% Disk Usage Issue: 1TB HDD, Startup Parameters & Potential Damage Lenovo Legion Y520 100% Disk Usage Issue: 1TB HDD, Startup Parameters & Potential Damage
  • #6 17039863
    Kolobos
    IT specialist  
    Why did you open this window in the EP? You were supposed to put the ENTIRE main window screen.

    Screenshots from HdTune that you posted are not smart ...
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  • #7 17039866
    KamilTiVis
    Level 8  
    Lenovo Legion Y520 100% Disk Usage Issue: 1TB HDD, Startup Parameters & Potential Damage

    Sorry informatics etc is my worse side. I am completely green in it so sorry in advance.
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  • #8 17039869
    Kolobos
    IT specialist  
    This is still NOT the ENTIRE window, not to mention the lack of a column responsible for writing to disk.
  • #9 17039903
    KamilTiVis
    Level 8  
    Lenovo Legion Y520 100% Disk Usage Issue: 1TB HDD, Startup Parameters & Potential Damage
    I still don't necessarily know what the whole window is about, after all, the main page of this program is all; d

    Added after 2 [minutes]:

    PS. Strange thing because now I have 9% disk usage and before 5min it was 100%
  • Helpful post
    #10 17039926
    Kolobos
    IT specialist  
    Maybe some updates were installed?
  • #11 17039929
    daminek1234
    Level 25  
    We are still waiting for SMART parameters.
  • #12 17039931
    KamilTiVis
    Level 8  
    @Kolobos I left all updates overnight when I restored the system to its original state so they should not but we will see let me know tomorrow or on Saturday whether the problem disappeared and whether it was a regular update about which windows did not inform me

    Added after 2 [hours] 38 [minutes]:

    daminek1234 wrote:
    We are still waiting for SMART parameters.

    Damianek so far the problem has subsided I am waiting for Sunday and if it does not return it was only an unwanted system update.
  • #13 17046805
    KamilTiVis
    Level 8  
    So far, it's good, but it was probably an update (but strange because I didn't get a notification or anything.)

    Added after 52 [seconds]:

    Simple system upgrade.
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Topic summary

✨ The Lenovo Legion Y520 laptop is experiencing a persistent 100% disk usage issue, despite reinstalling the operating system and ensuring all necessary drivers are installed. Users suggest checking the SMART parameters of the 1TB HDD and utilizing Process Explorer to identify processes causing high disk activity. The author reports fluctuations in disk usage, indicating potential system updates may have resolved the issue temporarily. Further monitoring is advised to confirm if the problem recurs after updates.
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FAQ

TL;DR: Lenovo Legion Y520 1TB HDD stuck at 100% disk? “100% disk usage all the time.” Start with updates, drivers, SMART, and Process Explorer. [Elektroda, KamilTiVis, post #17038369] Why it matters: You can avoid unnecessary drive replacement by confirming if Windows maintenance or drivers cause the spikes. This FAQ helps Lenovo Y520 owners fix persistent 100% disk usage after reinstall.

Quick Facts

  • Windows flags “100% disk usage in Task Manager” as a known symptom and provides step-by-step fixes. [“Fix 100% disk usage in Windows”]
  • Automatic Maintenance can run about 1 hour daily and trigger heavy I/O after a reset or reinstall. [“Automatic Maintenance (Windows)”]
  • Process Explorer exposes per‑process disk I/O; enable I/O Read/Write Bytes columns to spot culprits. [“Process Explorer - Windows Sysinternals”]
  • Check S.M.A.R.T.; rising Reallocated or Pending sectors indicate failing disks—back up immediately. [“S.M.A.R.T.”]
  • After reinstall, install Lenovo Y520 chipset and storage (Intel RST/AHCI) drivers from Lenovo Support first. [“Lenovo Legion Y520 Drivers & Software”]

Why is my Lenovo Legion Y520 HDD stuck at 100% disk usage?

Windows can hit 100% disk when services, drivers, or apps saturate I/O. Microsoft documents common causes and fixes. These include Windows Search indexing, background antivirus scans, browser cache activity, and service misconfiguration. Work through Microsoft’s checklist before assuming hardware failure. It covers checking drivers, pausing or adjusting services, and verifying system health. This targets the root cause without a reinstall. [“Fix 100% disk usage in Windows”]

How do I tell if Windows Update or maintenance is causing the spike?

Windows Automatic Maintenance runs daily and can consume disk for up to 1 hour. After a reset, it may run soon and feel constant. Let it complete, or schedule it for off-hours. You can confirm by noting activity during the maintenance window and letting the task finish. Disk usage should drop when maintenance ends. [“Automatic Maintenance (Windows)”]

How can I see which app is hammering the disk?

Use Process Explorer to reveal per‑process disk I/O. “Process Explorer shows detailed information about processes.” How‑To:
  1. Run Process Explorer as Administrator.
  2. View > Select Columns > Process I/O. Check I/O Read/Write Bytes.
  3. Sort by I/O Write Bytes to find top writers. Kill or adjust the identified culprit as appropriate. [“Process Explorer - Windows Sysinternals”]

How do I check HDD health (SMART) on Windows?

Install CrystalDiskInfo. Launch it and read the overall status (Good/Caution/Bad). Review attributes like Reallocated Sector Count and Current Pending Sector Count. If status is Caution/Bad, back up first and plan replacement. Export the report if you need help interpreting values. [“CrystalDiskInfo”]

Do I need to reinstall Windows to fix 100% disk usage?

No. Microsoft provides fixes that do not require reinstalling Windows. Start with updating Windows, checking drivers, and temporarily adjusting services like Search to diagnose. Confirm the offending process with Process Explorer, then remediate. Reinstall is a last resort after other steps. [“Fix 100% disk usage in Windows”]

Does 100% disk usage mean my drive is damaged?

Not necessarily. 100% indicates saturation, not wear. Check S.M.A.R.T. to assess health. Edge case: rising Reallocated or Current Pending sectors signal failing media. Back up immediately and replace the drive if these counts increase. Healthy S.M.A.R.T. with high usage points to software or configuration, not hardware failure. [“S.M.A.R.T.”]

Which Lenovo drivers should I update first to stop this?

Install the Lenovo Legion Y520 chipset, Management Engine, and storage controller drivers first. Update Intel Rapid Storage Technology or AHCI drivers before other utilities. Doing this right after a reinstall prevents controller quirks and reduces background device setup churn. Use Lenovo’s driver list for your exact Y520 model. [“Lenovo Legion Y520 Drivers & Software”]

How should I capture a useful Process Explorer screenshot for help?

Show the entire main window so columns and totals are visible. Enable the disk‑write column and include it in view. Sort by writes so top offenders appear at the top. Post that full-window image for diagnosis. [Elektroda, Kolobos, post #17038448]

Why did disk usage drop from 100% to single digits suddenly?

Background work finished. After updates, indexing, or maintenance complete, disk usage returns to normal. In this thread, the resolution was a “Simple system upgrade.” If you saw a spike after reinstall, let maintenance conclude, then recheck. [Elektroda, KamilTiVis, post #17046805]

Will upgrading to an SSD fix the 100% disk symptoms?

Often, yes. HDDs deliver random IOPS in the tens, while SATA SSDs provide tens of thousands. The higher IOPS reduces queueing and the 100% bottleneck feeling. You still need to resolve misbehaving software, but the system remains responsive during background tasks. Clone or clean‑install onto an SSD for best results. [“Solid-state drive”]

What if no single app stands out but the disk stays at 100%?

Check the file system. Run an elevated Command Prompt and execute: chkdsk /scan. If errors are found, schedule a repair and reboot. File system corruption can drive constant disk activity. Recheck after repair to confirm improvement. [“Check Disk (chkdsk)”]

How can I prevent future 100% disk spikes?

Let Automatic Maintenance complete or schedule it for off-hours. Avoid interrupting maintenance repeatedly. Spreading work across the daily one‑hour window prevents long catch‑up cycles. After maintenance, verify usage in Task Manager. [“Automatic Maintenance (Windows)”]
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