Tested with an external firewire disk:
sbp0: sbp_show_sdev_info: sbp0:0:0: ordered:1 type:14 EUI:0050770e00071002 node:0 speed:2 maxrec:8
sbp0: sbp_show_sdev_info: sbp0:0:0 'Prolific PL3507 Combo Device' '(1394-ATAPI rev1.10)' '012804'
da0 at sbp0 bus 0 scbus7 target 0 lun 0
da0: <Prolific (1394-ATAPI rev1 2804> Fixed Simplified Direct Access SPC-2 SCSI device
da0: 50.000MB/s transfers
da0: 305244MB (625140335 512 byte sectors)
da0: quirks=0x2<NO_6_BYTE>