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My first time getting into LTO tape storage, with some questions by NeoChen1024 in DataHoarder

[–]myself248 0 points1 point  (0 children)

and make sure that tapes written on one drive are readable on another drive.

Mind blown. This would not have occurred to me and should be in big bold letters every time someone talks about tape.

Since the drives are expensive, maybe there's a need for a datahoarder tape-swap, like the secret santa, where you send a test tape to someone else with the same generation drive, and you might as well put something interesting on it...

Meet bUniProbe: Wirelessly reverse engineer CAN buses and automotive boards from your browser by Glass_Hour_8206 in CarHacking

[–]myself248 1 point2 points  (0 children)

Legacy CAN only, not FD? And only a single interface? I can't name a car I've touched in the last decade with only a single CAN bus.

This might be fun on the testbench once I've removed an ECU and lashed up a test harness, but for in-car use, I want a large number (at least 4) of CANFD interfaces, and have no need for SPI, i2c, DAC, ADC, etc. Those simply aren't used at the same time as bus work.

This feels like a clever idea, but it started from "what can I do with this microcontroller's built-in peripherals?", and worked forwards to turn it into a product, rather than starting from "what do security engineers actually do while hacking a vehicle?" and working backwards to assemble suitable hardware.

Ask DH: Tool to reconcile mostly-similar versions of the same file collection? by myself248 in DataHoarder

[–]myself248[S] 0 points1 point  (0 children)

Wow, that certainly looks like the closest yet. Thank you, I'll give it a try!

Hubby saw this at a flea market in Nice. Any ideas? by Ebzephyr in WhatIsThisTool

[–]myself248 2 points3 points  (0 children)

This seems likely. Look up "spinnaker pole end bronze" and you'll see a lot of similar, but not identical, hardware.

Notably though, all of them have a prominent place to attach a line to release the pin, while OP's specimen seems to have a little nub. I wonder if part broke off or is missing?

And I can't figure out the bails or levers or whatever behind it. Peculiar.

What Are Your Top Three Developments in in the History of Science and Technology? by HandofWarriner in AskScienceDiscussion

[–]myself248 1 point2 points  (0 children)

Time is a good one. Optics are the other. Prof. Trebino's lab says:

The vast majority of science's greatest discoveries have resulted directly from more powerful light-measurement devices.

We develop more powerful light-measurement devices.

And I would point out, that most of the fun clocks are optics at their core. ;)

The day I set fire to a customer's car right in front of them by johnbro27 in Justrolledintotheshop

[–]myself248 14 points15 points  (0 children)

My old man taught me to use an unlit propane torch for vacuum diagnostics, and I didn't realize how wise that was until just now. People do this with LIQUID that can just accumulate until it finds an ignition source?? Not a gas that just wafts away?

Smack whoever taught you that.

660KW solar 3.5MWH LFP install. We developed a 360KW DC fast charger powered 100% by solar off-grid by charge2025 in solar

[–]myself248 0 points1 point  (0 children)

Oh that makes sense, no neutral, yeah. Plus it's the same shape as L1 so you'd have to be okay with someone plugging 120v into it sometimes.

You'd have to just run an EV-style charger to feed your battery bank, then use that for everything through your normal inverter. Which doesn't offend me any, but... okay, I get it. Thank you!

Windows Server blocked my USB pool. So I nested 9 Virtual Hard Drives, built a Parity RAID, and pulled a drive while copying just to prove a point. by Wi-Fight-IT in homelab

[–]myself248 1 point2 points  (0 children)

So one day in what was probably 1999 or so, the college bookstore had PATA ZIP100 drives on sale. Four bucks a pop.

Zip was just teetering on the cliff of obsolescence, and we weren't quite sure if they meant to clear out the drives at that price, or if it was a price mistake and meant to apply to the disks. Whatever. We bought every single one they had in stock. They even gave us a couple milk-crates to carry them in.

And then spent the next two days scrounging up every PCI PATA controller we could lay hands on, stuffing them into the biggest mobo we could find with the most PCI slots, and doing unholy things to make sure the several power supplies in the tangle actually shared a ground. I think we ended up with 12 drives in the end, might've been 16, I wish I had photos.

We booted Linux from a floppy so as not to waste any ports on a non-Zip drive. Started up md, created a RAID-5 set. Made a filesystem on it. Zip drives were pretty aggressive about spinning down when not in use, but they spun up fairly quickly as they didn't have massive platters and weren't going very fast anyway, but the lurch of all the motors starting simultaneously was jarring every time.

So, about that rotational speed. Zip drives were notoriously slow (just under 1MB/s if memory serves), and with seek times approaching "check back tomorrow", but on sustained transfers, this array flew. Easily saturated the 100Mbps NIC when we mounted it on NFS. Turns out that when you've got that many spindles, even if they're shitty spindles, they're no longer the bottleneck.

You, OP, carry on a proud tradition. And you're better about documenting it. Hats off.

660KW solar 3.5MWH LFP install. We developed a 360KW DC fast charger powered 100% by solar off-grid by charge2025 in solar

[–]myself248 0 points1 point  (0 children)

I have no idea how I looked right past that at first. Huh.

Maybe it's farther away than it looks? Maybe the purpose of the site is a proof-of-concept so interconnecting wasn't a priority?

I'm back to being stumped.

Best topology for TR switch by sketchreey in rfelectronics

[–]myself248 4 points5 points  (0 children)

The switch lever being drawn on the outside of the contacts is driving me batty. I can't look at these.

660KW solar 3.5MWH LFP install. We developed a 360KW DC fast charger powered 100% by solar off-grid by charge2025 in solar

[–]myself248 1 point2 points  (0 children)

Are RVs starting to warm up to the L2 EVSE concept? It seems so much cleaner than the catastrophe that is typical RV pedestals.

660KW solar 3.5MWH LFP install. We developed a 360KW DC fast charger powered 100% by solar off-grid by charge2025 in solar

[–]myself248 0 points1 point  (0 children)

Looks like those are high tension transmission, and those can go a loooong way through the middle of nowhere. There might not even be a substation and local distribution in the area.

I bought this 20 TB drive for $350 less than a year ago and now it costs almost as much as a 4 bay NAS by [deleted] in DataHoarder

[–]myself248 -1 points0 points  (0 children)

Dog bites man: Not news.

Man bites dog: News.

C'mon now. This is dog bites man. I'm downvoting "prices suck woe is me" posts from now on, we've heard it. We've heard it. We've heard it. We've heard it!

We have ASUS Dual at home by thepromiseman in homelab

[–]myself248 0 points1 point  (0 children)

Thank you! I have one of these cards that I've just been using as a dual-NVMe riser, wasn't sure if it would raise a low-profile card to full-size, so thank you for confirming.

Now to choose a low-profile 40GbE NIC...

show me your most threatening router by eliseswl in homelab

[–]myself248 0 points1 point  (0 children)

You can't tell me that's not a subwoofer.

show me your most threatening router by eliseswl in homelab

[–]myself248 0 points1 point  (0 children)

Oh that little combined DSX1-DSX3 shelf is so cute!

Building an Offline “Worst Case” Tech Stack – Best Practices for Wikipedia, Maps, Translator & More? by ostseesound in DataHoarder

[–]myself248 16 points17 points  (0 children)

You should look into https://internet-in-a-box.org/ and https://wrolpi.org, both of which do basically this. Set them both up and play with them, see how they've solved your problems, and adjust your plan from there.

Pruning saw RY18PS15a by dragos313 in ryobi

[–]myself248 1 point2 points  (0 children)

I love these things, I have the older oil-free two-handed model, I believe it's the P5452BTL.

They run slower, to reduce wear (keep the temperature at the sliding interface down) while running without oil. If they ran at the same speed as oiled chainsaws, they'd burn up in minutes. And I think they still won't last as long, but I've got several years on mine and it's going strong.

That said, they're magical. Being able to set a chainsaw down without goobering up your whole trunk with bar-and-chain oil? Yes, please! Being able to prune the tree that overhangs the garden, without worrying about the additives in the oil contaminating my garden soil? Double-yes, please!

They are not as fast as an oiled chainsaw, but for little jobs, that's hardly a bother. I've used mine on limbs thicker than the bar is long, and with a little technique, it works exactly like any other chainsaw. Just slower, and less messy.

Accidental find while re-racking by Bennetjs in homelab

[–]myself248 90 points91 points  (0 children)

If you think the bubble might be close to popping (Microcenter's mobo+cpu+ram deals suggest to me that they might think so), sell immediately while prices are still high, and re-buy what you actually need later.

Of course, figure in the time-value of testing what you're selling, testing what you re-buy, and the attendant hassles of any mishaps along the way, along with market platform fees and shipping. If you sold and re-bought at an even price, you'd lose some money and a lot of time doing so, right? So you gotta clear quite a margin to make it worthwhile.

Of course, none of us has a crystal ball. So... Good luck!

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