Typical card EEPROMs are serial - either I2C or SPI. I believe the
Intel cards use SPI EEPROMs, but I'm not sure.
[Disclaimer: I don't actually know SPI all that well; I know I2C better.
However, I'm pretty sure the following argument does apply to both.]
Consider a corruption which turns a read command into a write command --
often just a single bit difference. Now, the EEPROM will expect data in
to write, but nothing will be driving the data line, so it will
typically be a 1. As the host tries to read, it will therefore fill the
EEPROM with all ones.
-hpa
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