You can tune "kern.cam.scsi_delay",
Quote:
SCSI_DELAY (kern.cam.scsi_delay)
The SCSI_DELAY kernel configuration option may be used to reduce system boot times. The defaults are fairly high and can be responsible for 15 seconds of delay in the boot process. Reducing it to 5 seconds usually works with modern drives. The kern.cam.scsi_delay boot time tunable should be used. The tunable and kernel configuration option accept values in terms of milliseconds and not seconds.
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You can decrease it even more, I used to set it to 2 seconds (2000 ms), worked fine.
Other than this, check:
http://www.freebsd.org/doc/en_US.ISO...ning-disk.html
http://www.freebsd.org/doc/en_US.ISO...el-limits.html