Only once (or very few times) overwritten?
> on a shelf
At home or in a specialized room with controlled climate?
At least I cannot find quickly the requirement in someone (or a robot) pulling each tape once a year(?) and doing a rewind? Which is formally needed for HDD.
Btw, shouldn't HDDs be much more resistant to magnetic fields than magnetic tapes?
Edit:
26TB HDD Non-operating / storage:
Temperature -40 to 70°C (Storage 0 to 70°C)
Relative humidity 5 to 95% non-condensing
Maximum wet bulb temperature: 35°C non-condensing
Maximum temperature gradient: 30°C/Hour
LTO 9+:
Recommended Storage Environment: 15 to 25℃ / 20 to 50%RH / Max Wet Bulb Temperature: 26℃.
Stray magnetic field at any point on tape not to exceed 50 oersteds (4000 ampere/meter).
[1] https://documents.westerndigital.com/content/dam/doc-library...
[2] https://www.fujifilm.com/uk/en/business/data-management/data...
[3] https://www.ibm.com/docs/en/storage-deep-archive?topic=media...