[pincoball]

I think I've found the solution for DiskSpan based on the example script posted from Razor12911 at

https://www.fileforums.com/showthread.php?t=99627

What was missing is simply the initialization of DiskSpan inside the script (i.e. ClsInit), then in order to solve the problem of request of the next disk do as follow:

Look for this snippet of code inside the IS script:

if Data[i - 1].Arc[0] = 'Freearc_Original' then
[... other code ...]
if ISDoneError = False and not IniKeyExists('Records2', 'Type', ExpandConstant('{{#InternalRecords == "1" ? "tmp" : "src"}}\records.ini')) and ({#UseComponents} = 0) then
            begin
              if not ISArcExtract(0, 100, UpdateSource(Data[i - 1].Arc[1],SourceDir), Data[i - 1].Arc[2], '', false, '', ExpandConstant('{tmp}\arc.ini'), Data[i - 1].Arc[2], false) then
                ISDoneError := True;
            end else begin
              if not ISArcExtract(0, 0, UpdateSource(Data[i - 1].Arc[1],SourceDir), Data[i - 1].Arc[2], '', false, '', ExpandConstant('{tmp}\arc.ini'), Data[i - 1].Arc[2], false) then
                ISDoneError := True;
            end;
            end;

then substitute with:

if Data[i - 1].Arc[0] = 'Freearc_Original' then
[... other code ...]
if ISDoneError = False and not IniKeyExists('Records2', 'Type', ExpandConstant('{{#InternalRecords == "1" ? "tmp" : "src"}}\records.ini')) and ({#UseComponents} = 0) then
            begin
              ClsInit(ExpandConstant('{src}'),WizardForm.Handle);
              if not ISArcExtract(0, 100, UpdateSource(Data[i - 1].Arc[1],SourceDir), Data[i - 1].Arc[2], '', false, '', ExpandConstant('{tmp}\arc.ini'), Data[i - 1].Arc[2], false) then
                ISDoneError := True;
            end else begin
              if not ISArcExtract(0, 0, UpdateSource(Data[i - 1].Arc[1],SourceDir), Data[i - 1].Arc[2], '', false, '', ExpandConstant('{tmp}\arc.ini'), Data[i - 1].Arc[2], false) then
                ISDoneError := True;
            end;
            end;

The only difference is the line with ClsInit(...) function