Re: why would an SD card, after 12 hours, start to fail recording video?

[Arnd Bergmann <arnd@arndb.de>]

On Tuesday 24 May 2011 19:11:48 Robert P. J. Day wrote:
>   a maddeningly vague question -- i'm currently after more information
> -- but i've been told about an issue where someone is recording video
> to an SD card and, after 12 hours, the units begin to "fail."  that's
> all the info i have at the moment, i hope to get more so i don't even
> know what the definition of "fail" is here, or the brands or models or
> vendors involved, only what you read above.
> 
>   has anyone run across something like this before?  again, i realize
> this is annoyingly vague but if i had a hint as to what might be
> going on, i might be able to offer some advice.  what could possibly
> cause properly recording SD cards to start misbehaving after several
> hours?  thanks for any wildly speculative guesses.

There are many reasons why this could happen:

* You used a Kingston (or other cheap) SD card with a file system other
  than FAT32

* The partition is not aligned to 4 MB

* The cluster size is less than 16 KB

* You have multiple partitions on the card

If any of these are true, you have destroyed the card by writing a
lot of data to it.

	Arnd