It might be advertising, but I'll allow it because it's so metal
Titan submersible’s $62 SanDisk memory card found undamaged at wreckage site
131–140 of 221 posts
Re: Titan submersible’s $62 SanDisk memory card found undamaged at wreckage site
#132> No deep-sea shenanigans around the Titanic wreck were revealed. Manley explains in his Twitter thread that “the camera had been configured to dump data onto an external storage device, so nothing was found from the accident dive.” Nothing particularly pertinent to the tragic accident, that is.
This is about camera hardware and how it survived. It provides no information or footage about the incident (in case you were looking for it like I was).
Re: Titan submersible’s $62 SanDisk memory card found undamaged at wreckage site
#133Earlier quoted context omitted.
Can't bit flip errors also destroy encrypted volumes much more easily?
I think it depends. Encrypted filesystems typically encrypt contents of each file separately - that way you don't need to read / write the whole disk to read it write any individual file contents. Of course that means metadata may be in plain text or may be separately encrypted - again possibly folder by folder instead of all metadata at once. Exact details would vary with different file system encryption schemes. Wh…
> Encrypted filesystems typically encrypt contents of each file separately - that way you don't need to read / write the whole disk to read it write any individual file contents.
Ah, that's not true of "full disk encryption". It usually encrypts the disk blocks.
File-based encryption is stronger; you can use different protection classes on different files, you can use authenticated encryption, etc. iOS does it this way and I assume other systems have caught up, but don't know any in particular.
Re: Titan submersible’s $62 SanDisk memory card found undamaged at wreckage site
#134Earlier quoted context omitted.
No serious commercial product should be using a Teensy under basically any circumstance.
Can I ask why? I'm not really into microprocessors.
Usually (not always), something like a Teensy or a Pi Pico or an Arduino is treated like a development board for prototyping.
A person builds out their circuit using hardware they can solder/wire-up by hand on a workbench, maybe even with relatively-giant solderless breadboards, to prove the concept and the general design.
And a dev board can be great for spinning a few prototypes. It's quick to get started (code can begin being tested on-chip after just plugging in a USB cable), and to try different things and to make (and correct!) mistakes. (Blow up a Teensy? No worries; just grab another from the drawer, try not to make that same mistake again, and keep moving -- no esoteric soldering required)
But when the design is finished-enough and it becomes time to spin up custom-built PCBs for a final product that will be sold, a separate dev board like a Teensy tends to lose much of its initial charm.
Instead, it's more-typical just put the microcontroller IC plus whatever supporting hardware is necessary for the overall device's actual functions on the main board. Don't need USB, or an Ethernet PHY, an LED, a button, or a separate voltage regulator? Want more or less flash? When including the MCU on a board of one's own design instead of a kitchen-sink dev board, one is empowered to use exactly the parts that are required.
This can save a substantial amount of space and greatly improve the flexibility of the layout, while also improving mechanical and electrical robustness by having fewer connections between the MCU and the world around it. Plus, fewer parts tend to be less costly than more parts are.
(But again, it's not always done this way. This camera from the submarine is an example of one instance where the whole dev board was put inside of a finished product. Sometimes that's a good idea, and sometimes it isn't. I'm not attempting to suggest that it was or was not a good move in this instance.)
Re: Titan submersible’s $62 SanDisk memory card found undamaged at wreckage site
#135Earlier quoted context omitted.
He ridiculed anyone who told him he should, taking it as evidence that he was disrupting an industry. There is something slightly romantic about dying in such a way that his body turned to mist and floated away in the current. A bit like having your ashes spread at sea. With fewer steps.
I keep thinking about the teenager. Who didn't want to go and didn't feel safe, but who was pushed to come along by his father because it was his father's birthday.
Super tragic that one.
Re: Titan submersible’s $62 SanDisk memory card found undamaged at wreckage site
#136Earlier quoted context omitted.
Why isn't a cellphone filled with epoxy?
Because then it gets a 0/10 repairability score on ifixit :)
That can be avoided by filling it with a fluid that the repairman can simply drain instead.
People hydromod digital quartz wristwatches by filling them with oil. This gives them truly absurd water resistances and even improves the readability of the screen somehow.
Re: Titan submersible’s $62 SanDisk memory card found undamaged at wreckage site
#137Earlier quoted context omitted.
Can I ask why? I'm not really into microprocessors.
Usually (not always), something like a Teensy or a Pi Pico or an Arduino is treated like a development board for prototyping. A person builds out their circuit using hardware they can solder/wire-up by hand on a workbench, maybe even with relatively-giant solderless breadboards, to prove the concept and the general design. And a dev board can be great for spinning a few prototypes. It's quick to get started (code can…
That’s entirely true for manufacturing at scale. I really doubt they are selling a lot of these.
Re: Titan submersible’s $62 SanDisk memory card found undamaged at wreckage site
#138Earlier quoted context omitted.
Yes because external storage is much larger, and theres nothing more annoying than being in the middle of doing some science with 30 other bits of complex equipment, and then the camera stops working with storage full errors and youre 7000m underwater in a cramped sub trying to navigate a camera UI to find the setting. Configure your systems so they are in the configuration that is less likely to cause random disrupt…
Which makes me wonder why they bother with the SD card at all. What was it meant to be storing? If it is not intended to be the real storage area, why not just have it in a loop, constantly over-writing the oldest material?
The camera was an off the shelf part (from a very specialty shelf I suppose). It had an SD card built in because some people might not have a thing to stream to; it's probably good for demos and cheap enough to be good for a bullet point. Given the rest of the components inside they probably had enough margin that they weren't optimizing for costs. The value add was in the pressure vessel, and that seems to have mostly worked.
Re: Titan submersible’s $62 SanDisk memory card found undamaged at wreckage site
#139Earlier quoted context omitted.
Usually (not always), something like a Teensy or a Pi Pico or an Arduino is treated like a development board for prototyping. A person builds out their circuit using hardware they can solder/wire-up by hand on a workbench, maybe even with relatively-giant solderless breadboards, to prove the concept and the general design. And a dev board can be great for spinning a few prototypes. It's quick to get started (code can…
That’s entirely true for manufacturing at scale. I really doubt they are selling a lot of these.
JLCPCB will stick an IMXRT1064 and an oscillator on 5 custom PCBs for you for <$100 - the Teensy is basically $25-$35 for the same thing.
Re: Titan submersible’s $62 SanDisk memory card found undamaged at wreckage site
#140Earlier quoted context omitted.
There are some reasons you'd want to encrypt even without a secret key. One is it makes it easier to erase data (just erase the key). It also makes bit flip errors a lot more obvious, which is another way of saying harder to ignore, so that can go either way.
Can't bit flip errors also destroy encrypted volumes much more easily?
Most FDE systems are not authenticated so you would only lose one block (16 bytes for AES). Can this be bad? Yeah, but it's not that bad for data recovery.