Single-user mode, data recovery, mount usb I have a crashed hard drive. I had no luck with a USB to SATA using MacDrive Pro. I can get the drive to drop into shell with single user mode when I boot the drive. 

Can I mount a USB drive or something to copy data off?

I tried /usr/sbin/diskutil mount but I got a framework not being available due to single-user mode.

How can I back the data up?
You may also want to consider the Recovery partition if it's accessible.  Use CMD+R at boot to launch into Recovery mode.  This would let you mount a USB stick or even a network connection to transfer files.  

If you do have another computer available, you could boot this Mac into Target Disk Mode by holding the "T" key down at boot when you see the Apple logo.  This would allow you to then use the FireWire or Thunderbolt connection to plug your computer into another as a disk drive.