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I just checked (after having not used that rpi since the last update above) and it's still up and seems to be functioning normally. The increased power supply seems to have cleared up the issues. The only piece of data that doesn't fit that explanation is that I had the one I/O error after switching to that PS, but after the one I haven't seen that error ...


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Interestingly the power consumption of modern HDD is pretty low and comparable with an Rpi. https://www.pidramble.com/wiki/benchmarks/power-consumption suggests Rpi 3B is around 2W. https://www.quora.com/Do-SSDs-use-more-or-less-power-than-HDDs-and-by-how-much suggests WD Blue 500G is around 1.4W when active, idle 55mW, sleep .13mW So power consumption is ...


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Yes, even if they are not spinning, they consume power to keep the drive mounted and be able to communicate with the HDD. This schould be not an issue. In the domain of SBCs the more important thing is that each time they have to spin up the HDD for access, they consume a high peak current. USB 3.0 spec allows for up to 900mA. Depending on your power supply, ...


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Assuming you have a common battery connection that can supply the amps you need for all three devices, here's an idea: Why not just make two custom USB cables for the HDDs and snip the supply wire to the drives and connect them to your 5V supply separately? With the common ground between the three, I don't see any problem. Just make sure your 5V supply is ...


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I sorted this out with fstab. After lines mounting partitions added: /mnt/hddpartition/var /var none bind


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