What is fdc?

The genuine fdc.sys file is a software component of Microsoft Windows Operating System by Microsoft.
The process fdc.sys is a driver file, a component of the software Microsoft Windows Operating System. It's a special-purpose chip associated with disk controller circuitry that directs and controls reading from and writing to a computer's floppy disk drive (FDD).

FDC stands for Floppy Disk Controller Driver

Fdc.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 fdc.sys is a Windows system file or if it belongs to an application that you can trust.

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

Fdc.sys file information

The process known as Floppy Disk Controller Driver belongs to software Microsoft Windows Operating System by Microsoft (

Description: The original fdc.sys is an important part of Windows and rarely causes problems. Fdc.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 27,392 bytes (80% of all occurrences) or 25,088 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. There is no detailed description of this service. The file is a trustworthy file from Microsoft. The process is not active. Therefore the technical security rating is 2% dangerous, however you should also read the user reviews.

Recommended: Identify fdc.sys related errors

Important: Some malware disguises itself as fdc.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the fdc.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

fdc.sys could not be found during installation
  Isaac . O .  
It wont start cause it misses the fdc.sys file. Im trying to install Windows but it stops saying the file fdc.sys is damaged. So it seems to be needed allright :P

Summary: Average user rating of fdc.sys: based on 2 votes with 2 user comments. One user thinks fdc.sys is essential for Windows or an installed application. One user thinks it's probably harmless. One user is not sure about it.

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Best practices for resolving fdc issues

A clean and tidy computer is the key requirement for avoiding problems with fdc. 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, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the fdc.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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

fdc.sys [all]