suspicious f12 usb drive behavior

[Tom Horsley]

I'm off to gather more data, but I'm developing a deep
suspicion that something with external usb disk support
ain't right in fedora 12 x86_64.

With both the native usb on my motherboard and a
pcie usb card, if I copy the fedora 13 alpha x86_64
DVD to the usb drive, the sha256sum checksum
test fails on the copy.

If I do the same copy on the same hardware booted
from my old fedora 10 x86_64 partition, the copy
correctly matches the sha256sum test.

Anyone else with suspicious usb drive results
on large files?

It will take a while, but I'm off to try this several
times on both fedora 12 and fedora 10. If my results
are consistent, I guess I'll submit a bugzilla
(against the kernel?).