MacOSX-TerminalHints

Benchmark your SSD or hard disk speed 
    
To test write speed:
time dd if=/dev/zero bs=1024k of=tstfile count=1024

To test read speed:
time dd if=tstfile bs=1024k of=/dev/null count=1024

hdiutil convert -format UDRW -o ubcd.img /ubcd537.iso

diskutil list
insert your usb stick
diskutil list
diskutil unmountDisk /dev/diskN
sudo dd if=ubcd.img.dmg of=/dev/rdiskN bs=1m conv=sync
diskutil eject /dev/diskN