Quote:
Originally Posted by ProDigit
I'm not saying 4 months. I was running Windows and Ubuntu on these memory devices, which have significantly more writes than the small mobile OS of Kobo.
When SD cards go bad, they could have bad flash memory sector (which indeed takes years to turn bad). If it's one sector, that's located where an ebook is placed, you can delete, and re-download the book, so no harm done there.
If the bad sector is on a boot sector, that's another story.
There's also the possibility of a bad sector caused by a software error; which if any boot or operating system file is being written while the error occurs, could lead to a buggy or failing device.
Software errors could happen because of a variety of problems, and are probably the leading cause of buggy programs (next to buggy programming).
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All that applies to other flash memory too, not just micro-SD cards. The only fundamental difference between removable cards and other flash memory is that removable cards can fail as a result of physical wear when being inserted and removed, but that is not a problem when used as internal storage because they are usually only inserted once and not removed until they are to be replaced.
Micro-SD cards have their own firmware that includes error correction, wear balancing, fault management etc. so a single bad sector is not usually fatal, it just gets marked as bad and another one used instead, same as on a hard disc or other storage. The device firmware doesn't need to know anything about this, it is handled by the firmware on the SD card itself.