Guolin Cheng said: > Hi, William, > > Thanks. > > Then how to increase PCI IDE disk speed through adjusting PCI bus > speed? You don't. To quote ide.c: * ide_system_bus_speed() returns what we think is the system VESA/PCI * bus speed (in MHz). This is used for calculating interface PIO timings. * The default is 40 for known PCI systems, 50 otherwise. * The "idebus=xx" parameter can be used to override this value. * The actual value to be used is computed/displayed the first time through. In 99% of the cases idebus doesn't need to be changed. -- William Hooper