512 bytes or so. On the other hand, I am taking e2ls's word for it that it became corrupted (whereas it worked before the e2cp). It might actually work in real life, though.

Edit: It is probably relevant to point out that I'm trying to copy a file from my local Windows filesystem (the README.txt that you included, in fact) to a file containing an e2fs, as opposed to solely internal e2fs copying.