Log Message:-----------Document ATAPI drive flush command, and mention SSD drives.
Modified Files:-------------- pgsql/doc/src/sgml: wal.sgml (r1.62 -> r1.63) (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/wal.sgml?r1=1.62&r2=1.63)
