Question to the VLF folks, regarding DL4YHF's software "Spectrum Lab":

Does anyone know how to write very long waterfall spectral recordings to
a computer file but on a separate hard disk? In a way that they can
later be read back in and looked at in their whole length, scrolling
around between beginning and end.

If that is not possible, is there another software that can do this?

--
Regards, Joerg

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It can be done by mapping to an external drive and specifying the mapped drive as the write-to location. Be sure you have access permission to the mapped drive so you can write to it. I haven't tried it for extremely long files but see no reason it shouldn't work as long as a max file size isn't specified under 'audio file settings'.