Can one use a flashdrive in the Host USB as storage for BBB

I am new, and have been wondering if this can be done.

Yes.

Gerald

You can even boot from media on the USB host.

http://www.embeddedhobbyist.com/debian-tips/beaglebone-black/beaglebone-black-usb-boot/

William, did you notice any performance benefits from using the usb hdd?

Compared to netbooting, I lost around 1M/s reads, but doubled my write times.

So, 10.6MB/s reads, but ~20MB/s writes. I would not expect those speeds from a flash drive though, unless you have a super duper high performance model.