What is partmgr?
The genuine partmgr.sys file is a software component of Microsoft Windows Operating System by Microsoft Corporation.
"Partmgr.dll" is "Partition Manager", the kernel level performance metrics provider for the Microsoft Windows Operating System, located in "C:\Windows\System32\drivers". It maintains five metrics for computing physical disk performance in read and write dispatch routines and I/O completion routines: queue depth, total read and write request counts, total read and write time, total idle time, and total split (fragmented) input/output. The associated registry key is "HKLM\SYSTEM\CurrentControlSet\services\partmgr", having at least two subkeys, "Parameters" and "Performance." System startup may halt with a BSOD attributed to "partmgr.sys" because it scans storage devices for partitioning at system startup or when they are connected.
PartMgr stands for Partition Manager Performance Metrics Driver
Partmgr.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 partmgr.sys is a Windows system file or if it belongs to an application that you can trust.
Run a free scan to check for partmgr drivers in need of updating
Partmgr.sys file information
The process known as Partition Management Driver or Partition driver belongs to software Microsoft Windows Operating System by Microsoft (www.microsoft.com).
Description: The original partmgr.sys is an important part of Windows and rarely causes problems. Partmgr.sys is located in the C:\Windows\System32\drivers folder.
Known file sizes on Windows 10/11/7 are 53,120 bytes (28% of all occurrences), 56,176 bytes, 19,712 bytes, 134,552 bytes or 49,256 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs.
The program has no visible window. The file is a Microsoft signed file. The file is a Windows core system file. The file is digitally signed.
partmgr.sys appears to be a compressed file.
Therefore the technical security rating is 0% dangerous; but you should also compare this rating with the user reviews.
Uninstalling this variant:
In case of problems with partmgr.sys, you may also want to remove the entire program
Microsoft Windows Vista or
Microsoft Windows using
Windows Control Panel or visit the
www.microsoft.com website.
Recommended: Identify partmgr.sys related errors
Important: Some malware disguises itself as partmgr.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the partmgr.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.
Best practices for resolving partmgr issues
A clean and tidy computer is the key requirement for avoiding problems with partmgr. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.
To get your computer running as fast as it did on day one, you can 8reset your PC. Your personal files will remain intact, but any programs you installed will need to be reinstalled.
To help you analyze the partmgr.sys process on your computer, the following programs have proven to be helpful: ASecurity 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. A good Bantivirus software detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.
Other processes
plutotv.exe levelqualitywatcher64.exe icon6560581611.exe partmgr.sys fancontrol.exe apihelper.dll usbservice.exe ableton index.exe logismooth.dll ndspcshowserver.exe iobituninstaler.exe [all]
Score
User Comments
Burghard Wunderlich
Deon
praktisch denkender
Summary: Average user rating of partmgr.sys: based on 8 votes with 4 user comments. 5 users think partmgr.sys is essential for Windows or an installed application. One user thinks it's probably harmless. One user thinks it's neither essential nor dangerous. One user thinks partmgr.sys is dangerous and recommends removing it. One user is not sure about it.