You will need the following disk space on your Windows Server 2003 computer to install SP1:

   Install from a share       Install from a SP1 CD  
   Service pack    140 megabytes (MB)    140 MB
   Stored service pack files    20 MB at %SystemRoot%\Servicepackfiles\Servicepackcache       650 MB at %SystemRoot%\Servicepackfiles   
   Working space    350 MB    475 MB
   Uninstall files    270 MB    270 MB
   Total space once installed    430 MB    825 MB
   Peak usage during installation    780 MB    1340 MB

NOTE: See You receive a message that you have insufficient available drive space if you try to install Windows Server 2003 Service Pack 1