I want to know the answer to the following question:
Since when can most computers boot from USB mass storage devices?
All the background I'm provided with is that "However, USB has one important advantage, in that it is possible to install and remove devices without rebooting the computer (hot-swapping), making it useful for mobile peripherals, including drives of various kinds (given SATA or SCSI devices may or may not support hot-swapping).". Is that enough to answer the question?
Answer: no