Out of Disk Space
If the disk on which you are saving your file is out of disk space, refer
to the following article in the Microsoft Knowledge Base for steps to solve
your problem:
214245
XL2000: "Disk Is Full" Error Saving Workbook
The Save Process Has Been Interrupted
If the save process has been interrupted, refer to the following article in
the Microsoft Knowledge Base for steps to solve your problem:
214073
XL2000: Temporary File Created When You Save a Document
The Connection to Your Network Server Has Been Lost
If you cannot save your workbook to another location, refer to the
following article in the Microsoft Knowledge Base for steps to solve your
problem:
230164
XL2000: Error Saving File After Network Connection Has Been Lost