What is ftdisk?

The genuine ftdisk.sys file is a software component of Microsoft Windows Operating System by Microsoft.
The standard driver for Microsoft Window's Fault Tolerant volume, this application allows your Fault Tolerant disk to interface and communication with the operating system. FT Disk allows you to utilize redundant storage in Windows NT 4.0 and later. It gives you a wide variety of disk service abilities, including the ability to restore lost data. Founded in 1975, Microsoft's flagship product is the Windows operating system, which is installed on over 90% of workstations worldwide.

FTDisk stands for Fault Tolerant Disk Driver

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

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

Ftdisk.sys file information

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

Description: The original ftdisk.sys is an important part of Windows and rarely causes problems. The file ftdisk.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 125,056 bytes (87% of all occurrences) or 126,336 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The service has no detailed description. It is a trustworthy file from Microsoft. ftdisk.sys appears to be a compressed file. Therefore the technical security rating is 10% dangerous, however you should also read the user reviews.

Recommended: Identify ftdisk.sys related errors

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

computer will not operate with this error
  Troy Dorris  
windows op home starts up then stops and ftdisk.sys shows up on a blue screen and nothing else can be done except to turn off computer at switch.
My computer won't start because of it.
Error does not stop windows. I unchecked restart system in restart and recovery and that may have prevented freeze.
  Frank Fallon  
ftdisk error is related to errors on the drive which should be rectified by running chkdsk drive letter /r
  Frank Fallon   (further information)
ftdisk is related to dynamic disks (ft stands for fault tolerance). This driver runs whenever dynamic disks have been configured.
  Daan   (further information)
i fix the error by replacing hdd cable
The error is serious enough to trigger a blue screen. It can be easily fixed by restarting the CPU in Safe Mode, or by replacing the hdd cable. If opened, it could cause serious damage to the computer.
  Mike Caulk  
Just press F8 to going to boot menu at start, choose last working configuration, it will work. Before this Earlier, mine even can't be repaired using windows boot cd.
Dr.Web liveCD found ftdisk infrected with backdoor.tdss.2459, renamed ftdisk, now windows XP cannot load. [session3_initialization_failed]
ftdisk can be infectted with a virus
it's loaded at boot time and it handles the IO to basic disks. Contrary to what another poster noted, I think ftdisk.sys is for basic disks whereas dynamic disks do not use ftdisk.sys directly. Instead dynamic disks are part of LDM which is a more full-featured LVM layer (really a version of Veritas VM). If you get errors from ftdisk.sys check your disk for IO errors, etc. and/or registry "disk key".
  b mulligan   (further information)
FTDisk (Fault Tolerant Disk) is a driver which helps NTFS correcting errors or remapping sectors (data is lost) that arise from bad disk sectors or clusters. It is always started before NTFS file system driver (that mounts NTFS partition or volume) and after Disk Device driver (that controls disk device activities), thus preventing NTFS from mounting bad disk sectors or clusters. It helps NTFS with SCSI or non-SCSI disks or other type of disks, but not in all cases because there are cases when this driver simply cannot recover error. It is a layer between disk and file system.

Rating chart

Summary: Average user rating of ftdisk.sys: based on 22 votes with 13 user comments. 14 users think ftdisk.sys is essential for Windows or an installed application. 6 users think it's probably harmless. One user suspects danger. One user thinks ftdisk.sys is dangerous and recommends removing it. One user is not sure about it.

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Best practices for resolving ftdisk issues

A clean and tidy computer is the key requirement for avoiding problems with ftdisk. 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 ftdisk.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

ftdisk.sys [all]