Overwrites and multiple files

[Gt3pccb]

Hello, when running DiskSpd in a file system Write IO are overwrites.

How do I prevent any overwrites with DiskSpd?

It would also be great if DiskSpd included a switch for
Number of directories
Number of directory leaves
Directory depth
Number of files per directory
Number of queued IOs per directory.

so one could test ReFS more realistically.