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> Interesting. I never intended to use things like CD’s nor DVD’s as real long-term storage mediums, since I always planned on migrating forward, but Craig, please elaborate. Please tell us more about the lifespan of bits on an SSD card. I don’t know about such things. —Eric M. Here is a report by CLIR: <https://www.clir.org/pubs/reports/pub121/sec4.html> They list 20 years as the low estimate for writable disks, but I've encountered studies that put the number lower, around 7-10 years. Regardless, the estimate is in years rather than decades. SSD bits, however, are typically measured in hours (the Mean Time Between Failure (MTBF)). So, for example, a bit can be written over-and-over for 2 million hours. This assumes you're using the SSD regularly; my network hard drive is always on, so power is cycling through the drives, which I assume keeps the drive fresh. ( I'd recommend a SSD, that has its own power source, rather than SD cards, for this reason.) 2 million hours is about 200 years, so an order of magnitude greater than a writable disk. Cheers, Craig