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#disks

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#ALMA 2D #SuperResolution imaging survey of Ophiuchus Class I/flat spectrum/II #disks - discovery of new disk substructures: academic.oup.com/pasj/article/ -> New Super-resolution Imaging Reveals the First Step of Planet Formation after Star Birth / New Insights into Planet Formation from Public Data with New Imaging Technique: alma-telescope.jp/en/news/pres / nao.ac.jp/en/news/science/2025

The ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO) - Program Overview and Summary of First Results & many more papers: arxiv.org/abs/2506.10719 & agepro.das.uchile.cl/publicati -> #ALMA Reveals Lives of Planet-Forming #Disks: public.nrao.edu/news/alma-plan & news.wisc.edu/measuring-gases- & almaobservatory.org/en/press-r - observations of 30 disks change our understanding of the evolution of gas in the birthplace of #exoplanets.

arXiv.orgThe ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO): I. Program Overview and Summary of First ResultsWe present the ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO), a Large Program of the Atacama Large Millimeter/submillimeter Array (ALMA). AGE-PRO aims to systematically trace the evolution of gas disk mass and size throughout the lifetime of protoplanetary disks. It uses a carefully selected sample of 30 disks around M3-K6 stars in three nearby star-forming regions: Ophiuchus (0.5-1 Myr), Lupus (1-3 Myr), and Upper Sco (2-6 Myr). Assuming the three regions had similar initial conditions and evolutionary paths, we find the median gas disk mass appears to decrease with age. Ophiuchus disks have the highest median gas mass (6 M$_{\rm Jup}$), while the Lupus and Upper Sco disks have significantly lower median masses (0.68 and 0.44 M$_{\rm Jup}$, respectively). Notably, the gas and dust disk masses appear to evolve on different timescales. This is evidenced by the median gas-to-dust mass ratio, which decreases from 122 in the youngest disks ($<$1 Myr) to 46 in Lupus disks, and then increases to 120 in the Upper Sco disks. The median gas disk sizes range between 74-110 au, suggesting that typical gas disks are much smaller than those of well-studied, massive disks. Population synthesis models suggest that magneto-hydrodynamic wind-driven accretion can reproduce median disk properties across all three regions, when assuming compact disks with a declining magnetic field over time. In contrast, turbulent-driven models overestimate gas masses of $>$1 Myr disks by an order of magnitude. Here we discuss the program's motivation, survey design, sample selection, observation and data calibration processes, and highlight the initial results.

Days since I installed Debian on a new computer and completed a complex manual partitioning scheme involving stacked md, dmcrypt, and lvm while forgetting to create an EFI system partition, and so having to do the whole thing over from scratch:

0.

Argh. The installer should warn you about this earlier in the process. I always forget because I only do this every 3 or 4 years.

My experience with #FlashDrives recently has been mixed. I have no problem in encrypting them with #LUKS, using #cryptsetup or with formatting a partition with #Btrfs, for instance, using #gparted and doing other tinkering with #Gnome #disks. But the problem has been with the actual drives themselves. The cheaper ones seem to have quite a few bad sectors, etc. and so they’re not really reliable for medium term storage.

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I wonder if anyone can help me with a #Linux #USB issue. I’ve got a new flash drive on which I want to put a Linux directory structure on {with #EXT4, encrypted if possible). However, using the #GNOME #disks utility to #Format it apparently works but when I go into the disk’s root directory, I can’t create any files – I get an input/output error. If I reformat the disk as a #FAT (windows(disk then it works again and so I’m thinking there must be some problem with the utility I’m using.

zdnet.com/article/why-raid-5-s

Summary: #RAID 5 was dead in 2009 due to the size of disks. #Disks are guaranteed to have unrecoverable read error (URE) every N sectors of reading. Disks by that time were already over N sectors in size, so these errors were inevitable during rebuilds after one #disk failure. In other words, array failure was guaranteed for RAID 5 at the sizes of the time. The same would soon be true of RAID 6 as disk capacities increased and URE rates remained about the same.

ZDNET · Why RAID 5 stops working in 2009By Robin Harris

One important and often overlooked aspect of cybersecurity is proper disposal of electronic devices. When it's time to get rid of an old device, simply deleting files or formatting the hard drive may not be enough to prevent sensitive data from falling into the wrong hands.

A little-known tip to ensure proper disposal of electronic devices is to physically destroy the device's storage media.
#Mastodon #Tech #CyberSecurity #opsec #Linux #disks #Digital #cloud #MrRobot

Happy Hanukkah! 🕎

A few weeks ago, I shared the lost 1980 #games and #software of Israeli cartoonist Yaakov Kirschen, recovered from old floppy #disks. 💾

breakintochat.com/blog/2022/11

The collection includes ten games, demos, and experiments in artificial personality and artificial creativity developed for the Apple II, Atari ST, Amiga and IBM PC from 1983-1989.

Download them and try them for the holidays!