Here's something alarming for you...
I have a fully operational 256 and during the full 256MB dump of the nand I got these errors:
error reading block 4c status 218
error reading block 6a status 208
error reading block 1b0 status 210
error reading block 1b1 status210
error reading block 24b status 250
error reading block 7ca status 250
And when I dumped the 64MB part I got the same errors except the last two, because they were "out of range".
One might say I just have lots of bad blocks, but I know I only have one (B48) in the 64MB range, and it doesn't even show that one in the error report!!!
What are all these errors?