Hardware

# dd if=/dev/zero of=<dst_hard>

$ dd if=/dev/adX of=/dev/null bs=1m count=1024

$ top -m io -o total

# kldload coretemp
# sysctl -a |grep temp
net.inet6.ip6.use_tempaddr: 0
net.inet6.ip6.temppltime: 86400
net.inet6.ip6.tempvltime: 604800
net.inet6.ip6.prefer_tempaddr: 0
hw.usb.template: 0
dev.cpu.0.temperature: 35,0C
dev.cpu.1.temperature: 33,0C
dev.coretemp.0.%desc: CPU On-Die Thermal Sensors
dev.coretemp.0.%driver: coretemp
dev.coretemp.0.%parent: cpu0
dev.coretemp.1.%desc: CPU On-Die Thermal Sensors
dev.coretemp.1.%driver: coretemp
dev.coretemp.1.%parent: cpu1