AutoCAD Based Products File Save Process Explained in Detail

During a save here are all the steps that occur.  If any of these are interrupted, the process will fail and will give unusual errors, or cause slow behaviors. 

In this example, the AutoCAD Temporary Drawing Location is set to C:\ACAD Save 

2020-07-17_11-05-14

Drawing named Test DWG.dwg is located here: D:\Downloads\Test DWG 

2020-07-17_11-11-41

Some of these steps may occur without you ever seeing them (they are nearly instantaneous).

  1. Standard QSAVE (occurs regardless of ISAVEPERCENT setting) command is triggered (or SaveAs)
     
  2. Drawing save is initiated
     
  3. Test DWG.DWG in RAM is written out to a .tmp first to the Temporary Drawing Location (briefly – you may not see this step as it’s near instantaneous)

    2020-07-17_11-19-33
     
  4. Or the last Autosave (sv$ extension), if it’s enabled and has triggered at least once, is removed and renamed as a .tmp and the rest of the save process continues
     
  5. Then that .TMP file is moved to the destination location

    2020-07-17_11-24-00 
  1. Test DWG.BAK is renamed to a temp file with no extension 
     
  2. Test DWG.DWL & Test DWG.DWL2 are deleted (to allow modification to the Test DWG.dwg)
     
  3. Test DWG.DWG renamed to Test DWG.BAK
  1. Temp file with no extension is deleted
     
  2. The .TMP renamed to Test DWG.DWG

    2020-07-17_11-21-00 
  1. Test DWG.DWL & Test DWG.DWL2 are re-created (to lock the Test DWG.dwg again)
     
  2. Test DWG.dwg remains in RAM on the local machine for current session.
     
  3. Test DWG.DWL & Test DWG.DWL2 remain as-is (until user closes Test DWG.Ddwg, at which time they are deleted).

About the Author

Ryan Wunderlich

Sr. Technical Support Specialist<br><br>An AutoCAD Certified Professional, Ryan is responsible for taking client cases and assisting with issues with the software - everything from regular glitches to software deployments and whatever else goes wrong. He's proficient in AutoCAD (including customization), VBA, LISP, and Civil 3D.

Follow on Linkedin More Content by Ryan Wunderlich
Previous Article
AutoCAD Based Products Autosave files appear to be missing
AutoCAD Based Products Autosave files appear to be missing

AutoCAD Based Products Autosave files appear to be missing Issue: Your Autosave is turned on (and you see i...

Next Article
Error: “Error 1325 “” is not a valid short file name” when installing or launching AutoCAD
Error: “Error 1325 “” is not a valid short file name” when installing or launching AutoCAD

Folder redirection is a common cause of this error. Autodesk products have issues with redirected profile f...