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Allows users who use an IDE driver for their disk to use hpfall without having to modify the source. By default /dev/sda is used. Suggested by Christian Thaeter in http://lkml.org/lkml/2009/3/25/505. While we're add it, improve error message if opening /dev/freefall fails. Signed-off-by: Frans Pop <elendil@planet.nl> Cc: Christian Thaeter <ct@pipapo.org> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>