Kernel 2.6.27-10-generic seems to have improved reliability for me - I
copied about 1GB to the SD card while running update-manager, a VM in
VirtualBox, copying files across USB, with free memory under 22 MB,  and
didn't encounter any errors.

>From http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-
intrepid.git;a=commit;h=ee2ed9d8d3819bde1c82d55bd398eddae15d2fd5, it
looks like the -9 kernel (and therefore the -10 kernel) increases the
timeout to 300 ms instead of 250 ms.

But since Richard still had issues with a 350 ms timeout, maybe there
are some other improvements affecting mmc included in 2.6.27-10 as well?
My 1GB copy seemed to complete much faster than in my previous test with
the modified -8 kernel with timeout increased to 500 ms.

-- 
SDHC Card reader I/O errors on Hardy
https://bugs.launchpad.net/bugs/247819
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