Disk_Size of dropped table (Removing table from Harddisk)

Hi Everyone!

Im facing following problem with SAP HANA Studio SPS9. I´ve tried some CSV-Import via ctl-File into some dummy table. I was loading 8 GB CSV into HANA. When i noticed that the "Size on Disk" from my dummy table only gets bigger and bigger after every import. I drop the dummy table everytime before  I import a new one. Even if i drop my dummy table, the size on the Disk wont change. Its only raising after each import. I allready tried to delete the entries with truncate and then merge the delta manually.

Here is a screenshot of the table with only 1 entry.

Is there any way I can get my Disk space back?

Thanks

Regards

Johann