When HD first came into the Arrangers, it was to store styles, midi, userdata etc.
You could run the machine without any HD, as it was a high priced option/addon to
load/save rapidly and rise storage space dramaticly compared to floppydiscs.
As long as the HD contain data that is nessesary to boot up and run the keyboard,
a quick and easy recovery option is just as mandatory as UPS.

GJ
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)