Re: superblock checksum mismatch after crash, cannot mount

[Duncan <1i5t5.duncan@cox.net>]

Zygo Blaxell posted on Sat, 23 Aug 2014 12:38:05 -0400 as excerpted:

> Consumer SD cards are /terrible/ storage devices.  Always back up all
> data written to an SD card as soon as possible after writing it, and
> develop a process to restore the backup to a new SD card conveniently
> when--not if--the card fails.
> 
> Over the years I've burned my way through dozens of SD cards in Pis,
> Beagles, x86 laptops, USB SD card readers, cameras and cell phones.
> I have more bad or failed cards than good ones in my collection, but no
> more than three of any specific model.  Brand, price, and specs don't
> correlate to success or failure.  Even the good cards wear out after
> heavy use.  The bad ones fail much faster, and are more likely to give
> you garbage data instead of properly formed I/O errors as they fail.

I had read that it was bad, but I didn't know it was /that/ bad.  The 
ones I've used have tended to be write-once, read for quite some time, 
often lose (or throw away as obsolete due to tiny size) before I write 
them again, or at least before I write them half a dozen times, and I've 
generally not has problems with them doing that, but I wouldn't tend to 
know about routine rewrite behavior.  Sounds like it's much worse than I 
might have thought.

Thanks.

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman