What is sptd?

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

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

Sptd.sys file information

The process known as sptd or SCSI Pass Through Direct Host belongs to software sptd or SCSI Pass Through Direct by Duplex Secure.

Description: Sptd.sys is not essential for Windows and will often cause problems. Sptd.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 717,296 bytes (19% of all occurrences), 691,696 bytes and 28 more variants. 
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. It is not a Windows system file. The file is a file with no information about its developer. Therefore the technical security rating is 53% dangerous, however you should also read the user reviews.

Uninstalling this variant: You might want to do the following:
  1) uninstall Daemon Tools or Alcohol 120% from your computer using the Control Panel applet Uninstall a Program
  2) ask the developer, Daemon-tools, for assistance [1][2]
  3) verify that you have installed the latest version [1][2].

Recommended: Identify sptd.sys related errors

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

Does BSOD win Xp (logs error in event system log) but search does not find sptd.sys anywhere on HD.
Driver used by the CD Rom emulation program, Daemon Tools
  Victor M Sanchez   (further information)
sptd.sys is not a required component of the DaemonTools installation.That's fairly clear from the download page - it's listed separately.
Starburn free burning install it too. This is a tool for burning.
  Colpix   (further information)
RootkitRevealer detects sptd.sys when run; AVG 2014 detects other variants of it as a rootkit. It hasn't caused me a problem on XP, I have DAEMON tools lite installed. So, this is where the pest came from. I'm not sure what to do with it at the moment, as a registry mis-edit could crash my computer upon re-boot or make the computer totally unusable.
AVG warns as rootkit so to disable:
  Laurence Smith   (further information)
It is a safe file however in some cases it can cause problems and give BSOD, easiest fix as it is NOT an essential driver is to search for the file and just delete it, this eill solve the BSOD problems
after deinstalling Damon Tools the file persists. Avira can't open it.
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of sptd.sys: based on 180 votes with 9 reviews. 73 users think sptd.sys is essential for Windows or an installed application. 13 users think it's probably harmless. 37 users think it's neither essential nor dangerous. 38 users suspect danger. 19 users think sptd.sys is dangerous and recommend removing it. 12 users don't grade sptd.sys ("not sure about it").

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Best practices for resolving sptd issues

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

sptd.sys [all]