Regardless of where I check, the answer is always the same - It is a Western Digital External Storage file.
Wdcsam.sys with description WD SCSI Pass Thru driver is a driver file from company Western Digital Technologies belonging to product WD External Storage.
From another source ........
Publisher:Western Digital Technologies
Product:WD External Storage
There may have been a second (or External) HDD installed once, but the file is legal on all sites.
I can not even find any time it caused a problem ........... Do you have a specific problem ??
Please download and run RKill by Grinler.
A black DOS box will briefly flash and then disappear.
This is normal and indicates the tool ran successfully.
Post the small log back here -
Important: Do not reboot your computer until you complete the next step.
Please download AdwCleaner by Xplode and save to your Desktop.
NOTE : Please close or save all work, as the computer will be Rebooted
Double-click on AdwCleaner.exe to run the tool.
Vista/Windows 7/8 users right-click and select Run As Administrator.
Click on the Scan button. (only once)
AdwCleaner will begin...be patient as the scan may take some time to complete.
After the scan has finished, click on the Report button...a logfile (AdwCleaner[R0].txt) will open in Notepad for review.
If you see any which you do not want removed, remove the check mark next to it.
Next: Click on the Clean button (only once) to remove the selected items.
You will receive a message telling you that all programs will be close so that the infections can be removed.
Click on OK, and then OK again to confirm the reboot.
When cleaning process is complete a log (AdwCleaner[S0].txt ) of what was removed will be on your desktop.
Please copy and the paste this log in your next post.
A copy of all logfiles are saved in the C:\AdwCleaner folder which was created when running the tool.
After you run Clean then run this Temp File and Cache cleaner.
Download TFC by Old Timer to your desktop
• Close any open windows.
• Double click the TFC icon to run the program
• TFC will close all open programs itself in order to run,
• Click the Start button to begin the process.
• Allow TFC to run uninterrupted.
• The program should not take long to finish it's job
• Once it is finished it may automatically reboot your machine,
• if it doesn't, please manually reboot to ensure a complete clean
This may not remove the entry that you are concerned about, but it will make sure it is not harming your system.