Hi B,
It is possible I'm afraid!
- The software itself will easily take 15 GB. It will be larger if you have installed other languages.
- If you have patched it, there is a folder with the backup of the files for uninstall purposes. You do not want to delete this folder. You won't be able to uninstall patches or worst install new ones.
- Then the File Store... Only 500 MB in your case
- The Data folder will have temp and cache files
- Platform Search will always be big. You can reduce it by indexing less content. you can do this in the CMC > Applications > Platform Search. Have a look at page 16 of Best Practices for SAPBO BI 4.0 Adaptive Processing Servers. Just doing Platform Metadata will help. Make sure you deselect Universes also!
Hope this helps.