Hi Michelle,
With "parallel sessions" I meant two or more instances of SAS open at the same time, not one session after the other. This would give you two (or more) physically separate work folders, hence two physically separate formats.sas7bcat files.
The size of the format catalog does not seem to be an issue in your case.
Using a different configuration file should be no problem, I think, as long as you can copy the existing sasv9.cfg to any other place. However, you don't even need a different .cfg file to change the WORK system option. According to the documentation, "the options that are specified in the SAS invocation command" are processed at such a late stage, that they can override the settings in all existing configuration files. So, you can simply call SAS like this:
"C:\Program Files\SASHome\SASFoundation\9.4\sas.exe" -WORK "X:\your\path\to\SASwork"
(This would be the content of the "Target" field of the "SAS Properties" dialog box, of course with suitable paths.)
I've just tested it and, indeed, SAS created the session-specific work folder at the new location. My idea was to rule out potential (hardware?) issues with the disk where your work library is normally located.
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