Hi
I have had a problem recently when saving a Microsoft Excel spreadsheet
from my client machine which is Windows 98 SE to a Windows Small
Business Server 2003 shared folder.

I read most of the Microsoft knowledge base articles and tried them
without success. I also read most of the Google groups too without
success.

So what worked for me is this.
The file was only 5Mb in size.
The Server had no disk quotas.
I saved the file to my local My documents folder and it worked ok.
But why?
I tried saving it again to the Shared Server folder and it did not
work.
I came across an article about Microsoft word having problems with
links in pages that don't work and may be corrupt.
So I deleted a worksheet which I copied from another workbook to the
problem excel file.
Then I saved it to the server again and it worked. However I did not
want to delete my work so I put it back again and saved again to server
with the same problem.
I decided to see what was in my copied worksheet that might be causing
problems.
It had a lot of #REF and #VALUE in many cells so I deleted all of them
and saved the file to the server and it worked.
So I figure that if you are having trouble saving Excel files to a
server and get Disk is Full error then see if you have lots of #REF or
#VALUE in your cells and delete them or consider that a worksheet in
your workbook may be corrupt.

This worked for me. Let me know if it helps someone.
Regards
Dominic