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Cake day: July 1st, 2023

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  • It certainly is. ISO 27001 is a framework, not very prescriptive at all. Basically an auditor will ask “how do you ensure data isn’t leaving your facility in the form of discarded hardware?” If you say “here’s a link to our media destruction policy. It says all drives are wiped according to NIST 800-88 cryptographic erasure. If that is not possible or not applicable, the drive is destroyed. Here’s our log of decomissioned equipment” chances are very good they’ll say “OK great let’s move on to the next one” with only minor followup questions.



  • If the rise time isn’t 0, it’s not a square wave.

    And if that’s your definition then there’s no such thing as a real square wave.

    Just like no physical objects can have a perfectly square corner, there will always be some radius, even if it’s just 1 atom

    The reason making a true square wave is hard is that there are physical properties of real life electrical components that prevent voltage (or current) from changing instantly. Similar to how we can’t instantly accelerate a mass from 0 to some speed, it’s physically impossible. The faster you try to do it, the harder it is due to inertia. In electronics, there’s always natural capacitance and inductance slowing things down. If you want a 10v square wave, you have to push some amount of electrons through some amount of capacitance and inductance and that, while it can be very fast, is never instant.



    1. RAID for uptime, backups for data you care about. RAID(1+) will keep your data online when a disk fails, but backups are the real way to keep data around if shit hits the fan. For a personal media collection, you might be better served with a non resilient RAID0 (total failure if one drive fails) with a backup around to recover from when that happens. If you do e.g. a raid5 you lose 1 disk of capacity in exchange for 1 disk of resiliency, raid6 same but 2 disks. That gives you some safety but there are a lot of instances where those raids don’t save you from losing all your data. If you buy 4x 18TB drives, you could have 36TB from the 1st two drives and then backup to the other two drives.

    2. There’s no specific type of drive to worry about unless you’re doing RAIDs especially with ZFS. Search shingle RAID rebuild for the biggest thing to worry about there.

    3. Almost always, yes. Slow drives throttle the rest.

    4. I’ve never used them but people say good things about synology most of the time. Everything comes with a cost and it’s hard to make any sensible recommendations without knowing your constraints; primarily your budget.


  • This gets posted occasionally and while I agree, the subscription for an airbag is one of the dumbest things ever, it’s not the only way to buy the thing.

    It’s available as a one-time purchase instead, which obviously is what everyone here would choose, but it’s a fairly high price, and their argument for offering a subscription model is that they want the price barrier for safety equipment to be lower. There are other ways to do it, but the option of a subscription is fine IMO as long as the one time purchase remains as well.