Well, this is also the symptom when the card is finally worn out (then the controller should set the card to read-only so that data can still be accessed but further data loss will be prevented). And with some of the counterfeit/fake SD cards it's the same once they exceed their real capacity.
This (SD card dying) will happen to every SD card on this earth at some time unfortunately.
Coincidentally, it marked it read only after erasing it. If I could get a datasheet on the specific flash chip, I'd see if there's any special/proprietary commands that I could send it to unlock it. I know a lot of people have had trouble with RPi corruption, but I don't know if it "ruined" their cards since I never had that happen to me, yet.
I don't think I've used this card very much, but I really can't be sure. smartctl won't access it because of the USB interface on the adapter. I have a new nuc7 that has a microSD socket. I'll boot it on Linux and see if I can get smartctl to tell me anything. I would like to see the statistical data, assuming it has SMART capability. I have no idea if any SD card has that though.
It's possible that I bumped it when it was being manipulated by windows. I'm no fan of Windows, but I must confess that it generates a fair amount of business for me. Been a big Linux fan since the very early days of slackware and having to download floppy images.
I'm inclined to believe that something went wrong during a critical time, rather than it just happened to be worn out. Anything is possible, but it sure is an odd coincidence that this was my first use of etcher (beta).
Is there a specific place on the forum that i could discuss my slowish performance with iperf3 and hdparm? I'm getting about 250Mb/second on the Ethernet and a little less than 200MB/second using a USB3 to SATA adapter and a new Crucial 275GB SSD. Maybe I should take this up on the Pine64 forums since it's more Linux kernel related than OMV related.
BTW, dd shows the contents to NOT be erased. I would expect it to be all 1s if it had actually been erased.
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