BAD CAD - 10 steps to
regain your corrupted data
I often am confronted with files that fatal on corrupted data.
Finding and eliminating that data can be a challenge. Here are
a few tips to help out. Some are basic but deserve to be
- Purge the drawing - I am still amazed at how much
information is contained in files. You should get in the habit
of regularly cleaning your files. Check out my blog for "Purge -
The forgotten command"
- Audit the drawing - does more to correct problems than
- Restore the drawing from an old backup file. Think
back to the last time you had a stable file and retrieve it.
- Use Drawing Recovery to get the backup - check out
Lynn Allen's blog on the subject
- Cut and paste from the drawing in pieces. Select small
areas and copy them to a new blank file. Keep checking to
make sure that the new file is stable.
- Erase entities to see if you can find the bad ones.
Kind of the reverse of number 5. Working your way
backwards by erasing areas of the file and then when you find
the bad area, dump the file and then go back in and erase the
bad entity you found before.
- Save as an older version. Save the file back to older
versions (2002, 2000, etc.). This sometimes will jettison
the bad data and save the good stuff. Keep in mind that
saving back may effect the entities you created in new
- Open in another CAD package, PC or version. I often
use Microstation to fix AutoCAD files. You could try other
- WBLOCK the contents out. An old trick that still works
- REDRAW – no not the AutoCAD command. I mean re-draw the
drawing, or at least the troubled parts.