On Sat, Dec 15, 2001 at 04:18:39PM -0000, David Laight wrote:
> I believe that the reason for the discrepency is that the cards have some
> form of 'FTL' to allow single 512 byte sector to be written to a device
> where the chip erase sector is (probably) 128k bytes.
> 
> This also means that they inherently do 'wear leveling' - at least to some
> degree.

They also have error correction information which consumes part of the
raw memory space.

  -jm