That would be 170 CD’s - nearly 30 DVD’s - which will eventually suffer disc rot.
DVD/CD write speeds are very slow, comparatively speaking to even USB 2.0 transfer speeds - and increasing the speed, in my experience, makes exact copies of discs extremely error-prone.
Explain how this is efficient? Genuinely curious, with the price of solid state storage these days.
(I understand even solid state storage has a shelf life, but at least it also can’t be so easily harmed as a CD/DVD)
A microSD card can hold 500GB. DVDs (and even blu-rays) are far from "dense".
They also require an order of magnitude longer to write, lose their data to bit rot faster than SLC flash, and require devices with mechanical motors for both reading and writing.
I wouldn't call them convenient compared to flash memory, and I'm surprised anyone would.
Archival quality optical discs are marketed as having a 300+ year lifespan.
I've never viewed SD cards as something appropriate for long-term offline storage, is SLC flash exceptional in this regard?
I was comparing the convenience of optical to tape, which is bulky and annoying, and in my experience quite unreliable.
For especially valuable data you want to preserve for 100+ years, there are "archival quality" discs [0] [1].