Hello, On Tue, 22 Oct 2019, Patrick Shanahan wrote:
* Carlos E. R. <robin.listas@telefonica.net> [10-22-19 04:03]:
Indeed. My computers are now all on SSD, but the backups are all on HDs. Certainly cheaper and bigger, and perhaps safer.
larger and cheaper but definitely not safer. look on the net, consensus is for SSDs.
For (long(ish) term) backups? No sirreee! Simple physics. A magnetised region will keep its alignment unless disturbed[1][2]. A NAND cell will inevitably lose it's "bitness" over time unless refreshed. So, for cold storage "long-term" backups, rotating rust, or even better rust-on-nylon (aka tapes) or so is the way to go. And those you mention later going for SSDs, they are not backing data up on those SSD and store those SSD in a safe, are they? They'll keep those SSDs powered(!) (and RAIDed in some fashion) in a backup datacenter or some such scheme. But that's not a scheme for your J Random User, is it? -dnh [1] more or less indefinitely, depending on size and temperature and e.g. cosmic rays hittig, which might flip a magnetic region. A safe and controlled temps will help a lot against the latter and the middle. [2] the earth's magnetic field over the last millions of years has been reconstructed AFAIR from magnetic particles physically (not magnetically) "frozen" in magmatic rock erupted along the mid-oceanic ridges wherein the magnetic particles aligned to the then current magnetic field of the earth while the magma/lava was still fluid, and then (physically) frozen in their then alignment once the rock solidified. And if you get series of particles where e.g. N and S are flipped, followed by a series of chaos, and then todays N-S alignment ... Remember: the rock flows from the ridges, gets transported away ... Prime example is the the Atlantic Rift. -- "Ford, you're turning into a penguin. Stop it." -- Arthur experiences the improbability drive at work. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org