What is disk?

Disk.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if disk.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for disk drivers in need of updating

Disk.sys file information

The process known as PnP Disk Driver or Disk Driver belongs to software Microsoft Windows Operating System by Microsoft (

Description: The original disk.sys is an important part of Windows and rarely causes problems. The disk.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 36,352 bytes (85% of all occurrences) or 57,424 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. There is no detailed description of this service. The file is a trustworthy file from Microsoft. disk.sys appears to be a compressed file. Therefore the technical security rating is 3% dangerous, however you should also read the user reviews.

Uninstalling this variant: In the event of any problems with disk.sys, you might want to do the following:

Recommended: Identify disk.sys related errors

Important: Some malware disguises itself as disk.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the disk.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Runs On Dan Elec -ZMATE 32 GB USB Device
i know avg found it to be a virus. so, when i scanned another hd, avg removed the file. i just copied the one from my box and put it where the old one was on the other box's hd, all was well.
dunno but mine has a virus... so symantec says.  
File: C:\Qoobox\32788R22FWJFW\disk.sys Virus: Win32/Patched.DX
  Josh   (further information)
Microsoft Windows PnP disk file.
Disk.sys. Ist eine Systemdatei/Treiber für die Grafikkarte

Rating chart

Summary: Average user rating of disk.sys: based on 8 votes with 6 user comments. 5 users think disk.sys is essential for Windows or an installed application. 2 users think it's probably harmless. One user thinks disk.sys is dangerous and recommends removing it.

Do you have additional information? Help other users!
What do you know about disk.sys:
How would you rate it:
Link for more info:
Your Name:

Best practices for resolving disk issues

A clean and tidy computer is the key requirement for avoiding problems with disk. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the disk.sys process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

disk.sys [all]