BackupMii: What means "ECC Failure (Corrected)"?

I made two Dumps, one yesterday and one today. Yesterday I only got Bad Blocks (ok, I know). But today I got one time "ECC Failure (Corrected). What means that?
I know that a "ECC Failure" in the Installer.log is normal, but what means that Error with corrected while a Dump?

So, I asked that in the BootMii IRC Channel and got Banned, "Reason: Idiot".

I got that failure NOT in the installer.log, I got it while a NAND-Dump, between the BAD-Blocks....

It means that it found a problem and fixed it.

Magnetic media reading and writing is not an exact process. It isn't a matter of a 1 or a 0, but a wide variance of signal anywhere between a clear 1 or 0.

Hard drives, as they get denser, produce hundreds of errors a minute that are corrected by Error Correcting Code, which make informed decisions based on the surrounding bits whether this muddled bit is a 1 or a 0.

Same thing happens, in a different way, with flash memory.

You could have looked it up on wikipedia.

Quote
crazycarlt
Magnetic media reading and writing is not an exact process. It isn't a matter of a 1 or a 0, but a wide variance of signal anywhere between a clear 1 or 0.

Hard drives, as they get denser, produce hundreds of errors a minute that are corrected by Error Correcting Code, which make informed decisions based on the surrounding bits whether this muddled bit is a 1 or a 0.

Same thing happens, in a different way, with flash memory.

You could have looked it up on wikipedia.

Actually that is not true. It is ECC as in cryptography.

I got one too. it says corrected but when I restore its still there