computers

22 Jun 2026

Slashdot

Someone Forked systemd Over Its New Birth Date Field

The blog Linuxiac reports: A new systemd fork has appeared with a specific purpose: removing systemd's recently added support for storing a user's birth date in JSON user records. The fork, called Liberated systemd, published its first tagged release as v261 shortly after the official systemd 261 release. In other words, the fork follows upstream systemd while reverting the change that added the new optional birthDate field. Importantly, this is not a new init system, a wider redesign of systemd, or a general-purpose alternative to the upstream project. Its stated purpose is to remain close to upstream systemd while removing what the author describes as "surveillance enablement"... The author recommends testing the fork in a virtual machine before using it on real hardware and warns nightly builds are more likely to be unstable than named releases.

21 Jun 2026

Slashdot

The Secret Revolution in Battery Technology: 3-D Printing

"There's a revolution in battery technology hiding in plain sight," reports The Wall Street Journal. "The 3-D printing of batteries has the potential to put energy storage inside any device. "This will enable lightweight and long-lasting consumer gadgets, long-range military drones and even nanoscale robots." Almost all the innovations we regularly hear about - from cheaper, tougher electric-vehicle batteries to "Holy Grail" solid-state batteries - are about changing the chemistry of batteries. The promise of battery-tech 3-D printing (aka additive manufacturing) is simple: What if batteries could fill any available space, even structural elements of our gadgets, rather than always taking a rigid shape like a pouch or cylinder? The new approach has obvious appeal. The entire airframe of a drone could be filled with energy storage for increased range. Smartglasses could have sleek battery-packed frames, so they look like everyday eyewear rather than "Revenge of the Nerds" props. One of the biggest advantages of 3-D printing is that it works with any battery, regardless of its cell chemistry. It could advance today's lithium-ion as well as emerging sodium-ion and solid-state tech... Some [startups] are trying to use 3-D printing to create efficiencies in existing battery manufacturing systems. A brave handful of startups are pursuing radical new designs and approaches. They're starting with defense applications, where cost and scale are less of an issue... At Silicon Valley-based Sakuu... [r]ather than trying to 3-D-print whole batteries, the company is working on replacing one of battery manufacturing's biggest pain points, says Arwed Niestroj, Sakuu's chief operating officer, who is also a nuclear physicist and former head of Mercedes-Benz Research & Development North America. Existing battery assembly lines include football-field-long ovens for drying layers of material that have been dissolved in solvents. This requires a huge amount of energy and is a significant contributor to manufacturing costs, a big reason EV batteries aren't cheaper. Sakuu's process, under development for years, uses additive manufacturing to lay down key battery components without solvents, eliminating the need for ovens, says Niestroj. Sakuu is currently working to commercialize this tech with a major battery manufacturer...

Is Tesla Planning To Sell Modular AI Data Center Hardware?

Electrek reports: Tesla wants to sell modular AI data center hardware, according to a new trademark application for a product called "Megapod." The filing describes a complete, self-contained computing system for AI workloads... Tesla filed the "Megapod" trademark (serial number 99893717) with the U.S. Patent and Trademark Office this month, through its longtime IP counsel. It's an intent-to-use application, meaning Tesla is claiming the name for a product it hasn't launched yet. The goods-and-services description is unusually specific for a trademark. Megapod covers "modular data center hardware systems for artificial intelligence computing, comprised of computer servers, computer hardware for artificial intelligence data processing, networking equipment, power distribution units, and cooling systems." It also covers "self-contained modular computing hardware systems for artificial intelligence workloads," integrated platforms sold as a single unit - an enclosure bundling compute, power distribution, and cooling - and downloadable software to monitor, manage, and optimize those systems. In plain terms: Tesla wants to sell a turnkey AI data center building block. Not a battery, not a chip on its own, but the full rack-and-room of servers, networking, power, and cooling that AI training and inference run on. Tesla's offering would have to compete with Nvidia's liquid-cooled, rack-scale systems that simulates a giant GPU, the article points out. But "The bigger issue is that Tesla has no merchant compute-hardware business to build on." Tesla's own AI training cluster, Cortex at Gigafactory Texas, runs on roughly 67,000 Nvidia H100-equivalent GPUs. In other words, Tesla is one of Nvidia's customers, not a competitor selling alternative hardware... Where Tesla does have a real AI-data-center business is power, not compute. Its Megapack and new Megablock energy storage products are selling into AI data centers as grid buffers - Musk's own xAI has bought roughly $1 billion of Megapacks to keep its training runs powered. That energy-storage strength is the one credible thread here. A Megapod that bundles Tesla's power electronics, thermal management, and the enclosure - the "shell" around the chips rather than the chips themselves - would at least sit adjacent to a business Tesla actually runs.

OSnews

A tale of two path separators

In macOS, you can apparently create files and directories in the Finder with names that include slashes. If you then go into the terminal and take a look with ls, you'll see that the slashes are actually colons. I don't understand all the nuances, but I know this is a side-effect of the fact that macOS has not one but two path separators: the slash (/) and the colon (:). The two separators are used in different contexts, and the system will translate between them as needed. These two separators reflect the two parent systems of modern macOS: classic Mac OS and the Unix-like NeXTSTEP. When they were joined together, Apple's engineers had to build a file system that was compatible with both the classic Mac's file system (the Mac OS Extended File System, aka HFS+), and with NeXTSTEP's file system (the Unix file system, aka UFS). Among other differences, these systems had different path separators: HFS+ used a colon, while UFS used a slash. ↫ Alex Chan (article from 2021) I had no idea macOS worked this way, but it makes sense considering the platform's dual history. What's interesting is that when Apple moved to APFS almost a decade ago, this duality in path separators remained, most likely for backwards compatibility reasons. In a sense, this is somewhat similar to Windows supporting both backward and forward slashes, with the former being a leftover from DOS, and the latter an addition (to Windows) from the UNIX world. None of that beats Windows when using the Japanese or Korean locale, though. Because Japanese and Korean Windows use different codepages than Windows in the Americas and Western Europe, these versions of Windows render the backslash as the yen sign (¥) and and won (₩) sign respectively. As such, something like the Program Files directory actually renders like C:¥Program Files¥ and C:₩Program Files₩. Similar issues occurred in other Windows locales as well, but the impact of this in Japan and South Korea were so widespread that people just expect it to be that way, even if it's easily fixed today. I can't find if Windows 11 still uses ¥/₩ in Japan/South Korea, since the last references of it I can quickly uncover all point to Windows 10.

21 Jun 2026 9:09pm GMT

Apple internals: Swift in the kernel

Apple's Swift has become the de-facto language for Apple's own developers for a while now, and it seems that with the new operating system releases from the company unveiled during WWDC, Switch is now also being used in the kernel. Naturally I dropped what I was doing and went grepping through the iOS 27 kernelcache. Alas, nothing came of it. All is not lost though: I found the Embedded Swift runtime in macOS 27, sitting in com.apple.kec.pthread of all places. Then I went poking around the root filesystem and it turns out Apple gave the whole effort a name: KernelKit. Let's dissect it. ↫ Josh Maine It's still quite limited at this time, which makes sense - you don't want to be too crazy with the core of the operating system that runs on god knows how many PCs, smartphones, and other devices. It's also entirely contained within a few kexts as embedded runtimes, and the XNU kernel itself remains entirely C and C++.

21 Jun 2026 7:10pm GMT

“I stored a website in a favicon”

Every website has a favicon. It's that little icon in your browser tab. Usually you upload it once and then never think about it again. But. A favicon is just an image. An image is just pixels. And pixels are just bytes. So of course I wondered if I could store something inside one. ↫ Tim Wehrle I love it when people do something useless just for fun.

21 Jun 2026 6:58pm GMT