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libata currently imposes a UDMA5 max transfer rate and 200 sector max transfer size for SATA devices that sit behind a pata-sata bridge. Lots of devices have known good bridges that don't need this limit applied. The MTRON SSD disks are such devices. Transfer rates are increased by 20-30% with the restriction removed. So add a "blacklist" entry for the MTRON devices, with a flag indicating that the bridge is known good. Signed-off-by: Jeff Garzik <jgarzik@redhat.com>