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teceem: 25 days
You wanted an easy answer, ignoring any variables, right?
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Spectre: That's nice but you've fallen foul of your criticism by failing to specify what planets days you're talking about.
Why would the length of days on other planets than this one be relevant?
It's 25 earth days! I can't tell you why because my calculation system is a company secret!
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AB2012: Edit : I think the general rule of thumb was something like - in a continually unpowered state, SSD's have 15-50% electrical cell-leakage per year depending on a lot of factors including cell node size - the larger (older) the better, the smaller (newer) the worse, and the difference in SSD tech SLC (best overhead) vs MLC (average overhead) vs TLC (least overhead). But HDD's only typically lose between 2-5% electro-magnetic field strength per year (assuming they're stored away from strong electro-magnets).
Now it looks like it's how easy and how often a storage hardrive be refreshed and costs versus SSD with some kind of solar powered refresh device so you don't forget about it.
Post edited February 28, 2019 by Spectre
Obviously the Bryant Model-2 storage disc.
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Spectre: That's nice but you've fallen foul of your criticism by failing to specify what planets days you're talking about.
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teceem: Why would the length of days on other planets than this one be relevant?
because you're happy to ignore context and spit out silly answers that get you hoisted by your petard.
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firstpastthepost: Obviously the Bryant Model-2 storage disc.
The 'do not touch' stickers and it's placement seems ironic.
Post edited February 28, 2019 by Spectre
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Spectre: because you're happy to ignore context and spit out silly answers that get you hoisted by your petard.
I'm not ignoring context; I actually meant how context sensitive the difference is. Which SSD are you comparing to which HDD? Age? Brand? Model? Temperature? Writing? Reading? Random failure? Etc. There are so many variables.
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teceem: How about all those audio CDs, published early 80s, all outliers?
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Themken: A lot of my music cds from the eighties are unreadable due to the text having eaten through the metal on them :-(
I've been reripping my CD collection to FLAC. I have around 120 albums published in the 80s and they all play fine.
Only 1 CD had issues and it's from 2004 - though it might work fine on another CD player (but still, it's a bad sign).

So yeah, it's still my personal experience only - but 120/120 CDs is no small amount (statistically).