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Tragic Titan submersible’s $62 SanDisk memory card found undamaged at wreckage site (www.tomshardware.com)
submitted 10 months ago by to c/technology@lemmy.world
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cross-posted from: https://piefed.social/c/datahoarder/p/1386675/tragic-titan-submersibles-62-sandisk-memory-card-found-undamaged-at-wreckage-site

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[+] -8 points 10 months ago (2 children)

Yeah, but 512 GB? That's gotta be overwriting some data. The amount of data generated by sensors is massive.

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  • [–] 14 points 10 months ago* (1 child)

    What sensors do you think this was recording data from?

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  • [–] -1 points 10 months ago (5 children)

    Depth, pressure, location, etc.

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  • [–] 24 points 10 months ago* (last edited 10 months ago) (1 child)

    And what do you think that polling rate was to fill up a 512 GB SD card? It's all speculation but this isn't a super collider, we shouldn't need sub second polling of a vehicle that can only move 5.6 km/h.

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  • [–] 20 points 10 months ago

    And even if you sampled at 10 sps, and did 50 sensors at 10b, you would still only be looking 5000bps or 5.8x10^-7^ GBps, meaning that it would take roughly 26 years to fill up a 512GB SD card.

    While I don't know for how long the sub had been submerged, I doubt it was close to a quarter of a century. If that was the case, I believe that we would have been talking about that as well. Even if it was 500 sensors, at 100sps at 12b we'd be looking at 79days.

    IMHO there's only a few things a 512GB SD card would be used for. And I hope it was music, because I don't think we should watch the final moments of these people's lives.

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  • [–] 3 points 10 months ago (1 child)

    It's not going to have location data. GPS doesn't work under even very shallow water.

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  • [+] -6 points 10 months ago (1 child)

    Nobody said GPS (except for you). Location data does not mean GPS.

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  • [–] 5 points 10 months ago* (3 children)

    Ok, so tell me how you are going to get a location fix underwater, in the dark, with no landmarks to orient yourself, in constantly shifting currents?

    Even the Navy's most advanced nuclear submarines have to surface to get their location. This thing was a carbon fiber tube with an Xbox controller and an idiot designer.

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  • [–] -5 points 10 months ago (2 children)

    You use your starting point as a baseline and keep track of the movement of the craft.

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  • [–] 5 points 10 months ago* (last edited 10 months ago)

    Dead reckoning which is usually hit or miss on the surface but better than nothing. Probably worse under the water. It's why all these subs that dive to Titanic have to drop down until they hit the floor and then swim around until they find a landmark that points to the ship. They only have a rough idea of where they are when they get to the bottom.

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