[hakfoo]

I'm curious about "good storage conditions".

What are the threat models for tape, and how much do they vary for discs?

I assume if I leave either in my car in an Arizona summer day, it's toast. But are tapes more prone to mould damage in a damp climate, or media shedding if fed through a slightly out-of-adjustment drive?

The problem with M-disc was that it was always a sideshow on the mainstream optical disc market-- like LightScribe/LabelFlash, it was a feature most people weren't interested in except for possibly box-checking during purchase. The main audience was still people buying generic blank discs and burning single use discs or short-term backups.

There is/was an opportunity to box the product up with a clear marketing message of "here's a SMB-scale backup solution", something cheaper than tape, and more built-for-purpose than buying USB hard drives and dangling them off the back of a PC.

I'm picturing the M-disc technology but each disc is pre-installed in a cartridge to discourage accidental scratches/fingerprints/leaving surfaces directly exposed to the sun. It reinforces the "this is durable and you can probably put legal documents you might need for 5-10-20 years on it and leave it in a safe" story. This also creates a vendor-lockin product at a premium price, while quality conventional CD/DVD media was always competing with "but Fry's has spindles of 500 discs for $12.99!"

[UltraSane]

Optimal LTO tape storage requires a stable, clean environment, ideally 15°C to 25°C (59°F to 77°F) and 20% to 50% relative humidity (non-condensing), which can preserve data for up to 30 years. Tapes must be stored vertically in their protective plastic cases to prevent sagging and contamination.