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by avian
2198 days ago
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> Many problems with SD cards are actually rooted in power issues Does anyone have any info on this that's more substantial than hearsay? Experiments, measurements or at least a more technical explanation than "bad power source"? I'm persistently hearing this story that power supply quality affects SD card life. As an electrical engineer, and given what I know about R. Pi design, I fail to see how an SD card could get physically damaged by any reasonable power supply that would otherwise run the rest of the R.Pi. I suspect people are confusing filesystem corruption due to brownouts/OS not shutting down cleanly with physical damage to the flash (i.e. unreadable sectors on SD card) |
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Not SD card life indeed (in my case at least), merely IO failing, hosing the filesystem long term because of b0rked writes. The SD card is fine, it's just the data that eventually becomes inconsistent garbage.
I noticed the power LED showed the undervoltage behaviour, measured the power output which indeed showed the voltage not being stable on power spikes, so bought a better power supply, problem gone. Got the same kind of issue with greedy USB devices, so either went the powered hub route or used self-powered hard disks.