Digital odometer with flash/RAM memory for car

[swanny]

Can I query a piece of this, Swanny? Does that mean that my USB memory
key
has a limited life? ie 27 years once a day backups?

It will depend on the type of flash, however eeprom has a significantly higher
endurance than flash memory (several orders of magnitude).
I quoted the endurance (write cycle) figure for the flash and eeprom in the PIC
micro. The endurance of your memory stick and camera card may be the same, but
it also may be less. It is probably anticipated that you won't be writing to
this piece of hardware in 10 years time, let alone 27. Micros on the other hand
have a tendency to sit in a piece of equipment for a bit longer (20 or so years
in some cases).

Since the odometer value is only 3 bytes, it makes more sense to save it into
the on-board eeprom in the PIC.