JFYI, I've updated the charts to include the SanDisk Ultra II and Cheetah drive on the G4 to get a feel for whether the SE/30 is maxing out the device or not.
The update includes the UltraII card both on the G4's PATA bus as a slave, and using the SCSI-IDE converter setup as in the SE/30.
http://synack.net/~bbraun/se30disks/
The UltraII card has a much higher top end than the Cheetah drive. The SCSI-IDE converter seems to max out at about the 5MB/s of narrow SCSI-1 even though it is supporting the SCSI-2 protocol. But all of the above exceed the maximum values we're getting out of the SE/30.
The update includes the UltraII card both on the G4's PATA bus as a slave, and using the SCSI-IDE converter setup as in the SE/30.
http://synack.net/~bbraun/se30disks/
The UltraII card has a much higher top end than the Cheetah drive. The SCSI-IDE converter seems to max out at about the 5MB/s of narrow SCSI-1 even though it is supporting the SCSI-2 protocol. But all of the above exceed the maximum values we're getting out of the SE/30.