2004

98 | Chapter 8 Open an Existing Drawing
If your program terminates unexpectedly, AutoCAD tries to rename the
current backup file to prevent it from replacing the previous backup file.
AutoCAD uses the file extension .bk1 if that file name does not exist. If that
file name does exist, AutoCAD generates new file extensions in the sequence
.bk2 through .bk9 and .bka through .bkz.
You can revert to your backup version by renaming the .bak file using the
.dwg extension. You may want to copy it to a different folder to avoid over-
writing your original file.
Note You can turn off the backup feature on the Open and Save tab in the
Options dialog box. If you want AutoCAD to automatically save your drawing to
a file, you can use
OPTIONS to specify a time interval between save operations
and a file name for the temporary drawing.
To repair a drawing after a fatal or internal error
1 If AutoCAD encounters a problem and cannot continue, it displays an
error message and, for some errors, an error code. Record the error code
number, save the changes if possible, and exit to the operating system.
If the current drawing is unnamed, AutoCAD saves the drawing to the file
unnamed.dwg.
2 Restart AutoCAD and open the drawing that terminated.
If AutoCAD detects that the drawing has been damaged, it displays a
message asking if you want to proceed.
3 Enter y to proceed.
As AutoCAD attempts to repair the drawing, it displays a diagnostic
report. If the repair is successful, the drawing opens. If AutoCAD cannot
recover the file, it displays a message.