Deleting softraid Devices Fujitsu Sparc

Hi,

An error while deleting softraid device follows

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Available disks are: sd0 sd1 sd2.
Which disk is the root disk? ('?' for details) [sd0] ?
sd0: FUJITSU, MAT3073N SUN72G, 0602
serial.FUJITSU_MAT3073N_SUN72G_000506B00RAR_AAN0P5200RAR (68.4G)
sd1: FUJITSU, MAT3073N SUN72G, 0602
serial.FUJITSU_MAT3073N_SUN72G_000506B00SSL_AAN0P5200SSL (68.4G)
sd2: OPENBSD, SR RAID 1, 006 (68.4G)
Available disks are: sd0 sd1 sd2.
Which disk is the root disk? ('?' for details) [sd0] !
Type 'exit' to return to install.
www# bioctl -d sd2
bioctl: Can't locate sd2 device via /dev/bio
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The aim is to remove the device from the system and then:

# dd if=/dev/zero of=/dev/rsd0c bs=1m count=1
# dd if=/dev/zero of=/dev/rsd1c bs=1m count=1

to reuse the disks.

Thanks,

Kihaguru