On Wed, 23 Feb 2022 at 06:49, Tim via users <users@lists.fedoraproject.org> wrote:
> On Tue, 2022-02-22 at 12:21 -0500, Go Canes wrote: > > If it was just erasing the partition table the drive would still be > > visible using lsblk, and you could re-partition it with fdisk, etc. > > I do wonder if the devices were ruined, or just had their data > scrambled? Neal didn't say whether he'd tried reformatting the failed > ones, I presume he would have, but he just mentioned replacing them. > > Various magical incantations do sometimes seem to work: Solid State Drive SSD not seen in computer bios data recovery repair - YouTube <https://www.youtube.com/watch?v=BgddtpSEhQQ> Fix your dead SSD with the power cycle method - The Silicon Underground (dfarq.homeip.net) <https://dfarq.homeip.net/fix-dead-ssd/> fmadio | Recover Bricked SSD with JTAG <https://fmad.io/blog-ssd-bricked-restore.html> > > You mentioned a surge suppressor strip - any chance it has already > > suppressed a surge in the past? If so, it might not be functioning > > as a surge suppressor anymore. > > Every day your house receives lots of surges. Most you'll never > notice. There's not just the times you notice the lights suddenly > glowing brighter. There's very fast and large spikes from the > continual switching of loads across the grid, and how the stations > manage them. Because of this, surge protectors are always working, and > will eventually die without you probably being aware of it. > I used to add surge protection to power bars. We had a tree fall on the cable coax that they had installed without a proper anchor, just a zip tie to the mast for the AC power. The mast was pulled off the house, which meant the neutral line got disconnected first, and lightbulbs went off like flash bulbs. My Victor 9000 PC with the home-made surge protection survived, but we lost the doorbell transformer and a radio (and the thyristers in the surge protector). My father in law also used home-made surge protectors. A truck hit a high-voltage distribution line, causing the high voltage wires to fall onto the lower voltage feed to the house. His computer survived, but some appliances died. > > It's worth remembering that a surge protector may not protect your > equipment from being wrecked, primarily it should blow a house fuse on > a large surge to prevent some equipment catching fire and burning your > house down. > My power bar had a circuit breaker which did trip. > > If you have noisy mains causing you a problem you want mains filtering, > possibly a UPS as well (a constantly running one, like a power > conditioner, not a changeover one that supplies raw mains until it > kicks in as a backup supply). > > For what it's worth, considering my opening paragraph about the mains > always has spikes on it all day every day, that's normal. Any > equipment that requires external protection has not been built > correctly. Anything that plugs directly into the mains should be able > to handle what's normally on the mains, for its entire operational > life. > I grew up in an area with frequent power outages. My parents were careful to unplug computers when not in use. We often put an overhand knot in power cords. One day I had just turned on an electric kettle when lightning hit near the house. The kettle had a metal base with a hole where the cord passed thru and a 2-conductor cord. The cord burned off at the hole -- I assume an induced current took a shortcut from one conductor to the other. Nothing else was damaged. > The exception I make about that rule is when you want to minimise noise > on something that can handle it without damage, but the effect is > noticeably annoying and you want to reduce it. But again, the > equipment really should have been designed better. Stereo systems, for > instance, shouldn't crackle along with mains pops. > At work we had a small machine room with a window in the door. One day during a storm I was walking past the room when lightning hit the building. I saw a bright trail down the corner of the room and across one of the SGI Octane workstations. Those systems had a heavy metal chassis under a plastic cover, but there was a light bar outside the chassis. One of the incandescent bulbs in the light bar burned out, but that was the only damage. Better designed equipment costs more. I generally try to buy gear that has been on the market a couple years, which gives time for drivers to make it into the kernel and for design flaws to be noticed. Vendors often reduce prices just before introducing new models. I once scored a PowerEdge server with full complement of ECC memory for the price of the memory days before a newer model was announced. -- George N. White III
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