I suspect that you are executing the nvreorg command from the DOS Command menu choice in the NewViews Shell.
You need to close Newviews and open a command prompt and navigate to the NewViews program directory to execute the nvreorg command. For example, C:\NV>
The nvreorg command checks to see if there is enough disk space on the drive which is one third of the datad.nv file you are attempting to reorganize.
Back in the 1980’s and 1990’s when hard drives where measured in megabytes, this problem was a non issue. As hard drive space increased, the DOS command prompt from the NewViews shell misinterpreted bytes free on the physical disk.
I hope this helps.
Regards to All,