Disabling write cache by default or with option.

[ndenev]

Hello all,

What do you think about adding an option (or even making it default)
for disabling the write cache on IDE disks. (sysctl hw.ata.wc)
I think this can be very helpful in case of crashes, and the performance impact
will probably be negligible for a router/firewall device.

Regards,
Niki