AutoCAD 2010 Save Options
When you open a file in 2010 and save it, you have several options
Obviously, you can save it in the native 2010 format. This is the
default setting and you need not do anything to make it happen. But you
may need to send files to those who are using other formats. there are
several formats that can be used.
You can also save a drawing to an earlier version of the drawing
format (DWG) or drawing interchange format (DXF), or save a drawing as a
template file.
More online...
Saving back to a prior version
When you save back to a prior release, there are some impacts to the files.
Here are some of the limitations that affect files that are saved in prior releases. plucked from the AutoCAD 2010 help file with some edits and comments.
Saving a drawing in Release 2000/LT 2000 format is subject to the following limitations:
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File size can increase. - I did a quick test and saw my files go up from 10-20 percent when saved from 2010 back down to 2000 format. I then opened the 2000 based file and saved it as 2010 and it reduced the files size lower than the original 2010 drawing I had opened in the first place.
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Encryption and digital signatures are not preserved. - I never use these anyway.
More online...
AutoCAD 2010 -
SaveFidelity
When working with annotative objects in 2010,
this option allows you to maintain visual fidelity for these objects
when they are viewed in AutoCAD 2007 and earlier releases. Visual
fidelity is controlled by the SAVEFIDELITY system variable.
SAVEFIDELITY - Controls whether the drawing is saved
with visual fidelity.
0 = Saved without visual fidelity.
1 = Annotation objects assigned annotative scales are
saved to separate layers for each scale used. Only affects drawings when
saving to AutoCAD 2007 or earlier file formats.
If you work primarily in model space, it is
recommended that you turn off visual fidelity (set SAVEFIDELITY to 0).
However, if you need to exchange drawings with other
users, and layout fidelity is most important, then visual fidelity
should be turned on (set SAVEFIDELITY to 1).
Read the rest
HERE
AutoCAD 2010 - Objects may be larger than they appear
Buried inside the Options Dialog box is a little check mark that can
affect the way your files are stored and size limits of individual
objects.
People use AutoCAD for many things.
Most of the time, objects
storage sizes are small. But sometimes things can get quite large.
Individual objects use to have a limit of 256MB - have you ever
drawn anything that big?
You may have with a mesh or an extremely large
hatch pattern. Maybe by mistake you have had AutoCAD chunk away at
creating something like a hatch and have it choke because it is too
large.
Now you can avoid that... but it might cost you if you are saving
files back to prior releases.
Here is the
rest of the story...
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