[HN Gopher] Harder Drive: Hard drives we didn't want or need (20...
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Harder Drive: Hard drives we didn't want or need (2022) [pdf]
Author : a022311
Score : 79 points
Date : 2024-08-05 08:10 UTC (4 days ago)
(HTM) web link (tom7.org)
(TXT) w3m dump (tom7.org)
| alexwasserman wrote:
| There's a fantastic associated YouTube video that talks through
| these too: https://www.youtube.com/watch?v=JcJSW7Rprio
|
| It's a rabbit hole that had be fascinated for quite a while.
| e1gen-v wrote:
| Tom7 is the goat. Love his videos.
| ivanjermakov wrote:
| Dupe of https://news.ycombinator.com/item?id=30974165
|
| Tom7 content deserves being posted every day though.
| lesuorac wrote:
| Wish Lorem Epsum became a real phrase as well.
| ffhhj wrote:
| Epsum didn't lorem self.
| fragmede wrote:
| Google calendar fs, using Google calendar to store data in
| events, was inspired by this. Any others?
| quantumish wrote:
| it's not directly inspired by tom7, but there's pifs:
| https://github.com/philipl/pifs
| baliex wrote:
| Figure 1 is somehow beautiful in it's chaotic dis/organised
| structure, a representation of the whole internet _, something
| which us humans now so heavily rely on
|
| _ ipv6 yadda yadda yadda
| MostlyStable wrote:
| I think this is a candidate for best two sentence combo ever
| written:
|
| So we have 1 million chainsaws per second, for 335.36 hours,
| which is 1.215 x 10^12, a configuration known as tera-wield. This
| requires expert juggling skills.
| trey-jones wrote:
| The straightfaced and unhinged nature of the chainsaw section
| reminds me of Hitchhiker's Guide to the Galaxy, and probably
| some Kurt Vonnegut stuff. I love this style of writing.
| nextaccountic wrote:
| I would nominate this one
|
| > Tetris is an inventory-management survival-horror game with
| 19 principal characters, each with its own story arc
| jdietrich wrote:
| For those who might not be aware, early computer memory relied on
| essentially the same principle:
|
| https://en.wikipedia.org/wiki/Delay-line_memory
| IIAOPSW wrote:
| I have a crazy idea. The round trip travel time of light to the
| moon and back is about 3 seconds, and we did leave a mirror up
| there. At modern modulation rates and with multiple frequencies
| of light in use at the same time (aka different color lasers),
| a lot of data can fit into that 3 second window.
|
| A memory made of the vacuum of space. The lightest hard drive
| ever.
| Animats wrote:
| Sure. You can also do radio moonbounce, which radio hams
| routinely do.[1] About 2.5 secs of lag. It takes a sizable
| antenna. You could probably use that as a delay line. Noisy,
| so error correction will be necessary.
|
| Laser moonbounce is harder to do than radio.[2] Early systems
| used so much laser power that they had to be equipped with
| radars to turn the system off if aircraft were in the area.
| Later systems with safer lasers could detect single photons
| with a 40cm telescope and transmit a 2KHz signal.
|
| [1] https://en.wikipedia.org/wiki/Earth%E2%80%93Moon%E2%80%93
| Ear...
|
| [2] file:///home/john/Downloads/SLR2000_Eyesafe_and_autonomou
| s_single_photoelectro.pdf
| IIAOPSW wrote:
| This seems more like the airplanes problem than my
| problem...
| ben_w wrote:
| The judge is unlikely to agree with you.
| LegionMammal978 wrote:
| Would you have a working link to that second PDF?
| Animats wrote:
| Here are some SLR2000 papers that are more easily
| accessible.[1][2]
|
| Doing this with low-power lasers requires rather good
| receiving optics.
|
| There has been a major breakthrough in laser data
| transmission - the first cat video has been sent by laser
| to and from a spacecraft. "At the time, Psyche was
| traveling 19 million miles (31 kilometers) from Earth,
| about 80 times the distance between Earth and the Moon.
| Traveling at the speed of light, the video signal took
| 101 seconds to reach Earth, sent at the system's maximum
| bit rate of 267 megabits per second."[3]
|
| [1] https://ilrs.gsfc.nasa.gov/lw15/docs/papers/SLR2000,%
| 20The%2...
|
| [2] https://ilrs.gsfc.nasa.gov/lw13/docs/presentations/ad
| v_degna...
|
| [3] https://arstechnica.com/space/2023/12/a-cat-video-
| highlighte...
| pixl97 wrote:
| Being the moon is not geostationary this doesn't seem very
| useful.
|
| Also between atmospheric distortion and dust/micro meteorites
| you'll going to need to be very careful on your error
| encoding choices.
| wffurr wrote:
| "The same principle" as the first of the harder drives. There
| are several drives presented.
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(page generated 2024-08-09 23:00 UTC)