Deutsch

What is Fastfat?


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

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

Fastfat.sys file information

The process known as Fast FAT File System Driver belongs to software Microsoft Windows Operating System by Microsoft (www.microsoft.com).

Description: The original Fastfat.sys is an important part of Windows and rarely causes problems. Fastfat.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 8/7/XP are 143,360 bytes (78% of all occurrences), 143,744 bytes, 145,152 bytes or 144,768 bytes. http://www.file.net/process/fastfat.sys.html 
The driver can be started or stopped from Services in the Control Panel or by other programs. The file is a Windows system file. The program is not visible. There is no detailed description of this service. The Fastfat.sys file is a Microsoft signed file. Fastfat.sys appears to be a compressed file. Therefore the technical security rating is 1% dangerous, however you should also read the user reviews.

Recommended: Identify Fastfat.sys related errors

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

Score

User Comments

file used in raid or scsi setups in Microsoft OS's
  James Urwiller, Service Manager Computer Warehouse #4   (further information)
I deleted fastfat.sys off my laptop and now everytime i plug in a protable drive or digital camera it prompts me to format the external drive.
  Andy  
When not loaded, cannot read from a floppy or USB memory stick.
   
when i tried installing windows after a fat32 format i get tis sot error i.e. STOP:0X00000050 ( 0XA11B7A4C,0X00000000,0XFC795AD6,0X00000002 ) fastfat.sys-Address FCF9AD6 base at FC&8D000 DateStamp 41107EB7
  Nelson  
This is the driver for reading/writing FAT formatted drives (usually USB sticks, smaller external drives, and those devices appearing as drives such as digital cameras and mp3 players)
  Tim, Senior Electrical Engineer  
needed to mount FAT-based drives (USB sticks, floppy/tape drives)
   
I have a customer of mine with multiple infections. According to one of my Infectious Removal Tools C:\WINDOW\System32\dllcache/fastfat.sys is an infection.
  PC Recovery Technician.  
Essential for USB Sticks, when crash occurs at boot, remove all USB storage devices
  Chicken  
Used by TrueCrypt when encrypted volumes are formatted with FAT. Also used, as others have said, for other FAT-formatted volumes.
  IT Fixt  
FAT kernel-level file system driver loaded via IFS for Windows NT 4.x upwards
  Some Nerd   (further information)

Rating chart

Summary: Average user rating of Fastfat.sys: based on 16 votes with 10 user comments. 13 users think Fastfat.sys is essential for Windows or an installed application. One user thinks it's probably harmless. One user suspects danger. One user thinks Fastfat.sys is dangerous and recommends removing it. One user is not sure about it.


Do you have additional information?
What do you know about Fastfat.sys:
How would you rate it:
Link for more info:
Your Name:
 

Best practices for resolving Fastfat issues

A clean and tidy computer is the key requirement for avoiding problems with Fastfat. 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 doing a repair of your installation, or in the case of Windows 8, 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 Fastfat.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

Fastfat.sys [all]