When using the structure based IO method, RPG will create the initial storage for the input and output buffers, along with storage for the null indicator map.

Because they map database data to underlying physical storage (raw disks, file systems, volumes), understanding them in a new platform is critical for DBAs.

It's also possible that a tiny remainder sda_freespace1 will continue to exist if the available storage on the hard drive does map cleanly to the partition sizes that I choose.