Follow-up Comment #1, bug #37606 (project grub):
It's not 400 but 1024. And at this message it writes to core.img file, not to
some sector. It's underlying function responsability to set grub_errno
(through grub_error). As to apparent writing failure it's due to the lack of
necessary flushing ioctl (Linux API is broken in that write doesn't
necessarily actually writes unless you add a bunch of ioctl) which is fixed in
latest code.
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