sparing bad blocks

[Carl "Art" McIntosh]

How does one map out bad sectors under ISC 2.02 ? 
I have tried to map out a new bad sector reported
by a console message giving the absolute sector,
the drive and controller numbers.  According to
the man page mkpart(1M) the -A option should do
the trick, however mkpart -A 266867 disk0 yields
the message V_REMOUNT failed and informs me a
reboot or remount or the device is required. 
after rebooting the system, the /etc/partitions
file does not list the new bad sector, furthermore
mkpart -t vpa disk0 does not show sector 266867
as having been remapped.  Anyone know how this
supposedly simple procedure is done ?

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