It depends on how many USB slots you have. If you do in fact have more than one, that yes you can have more than one USB in at a time.
either it doesnt really matter but the second time is probalby better for ur USB
You/someone have installed the USB device as an bootable usb, format it to 600mb, then format it again, this time choose 2GB.
You just need to insert the flashdrive on the USB reader and plug the reader on your PC or laptop. USB reader is mostly used if you wanted to insert 2-3 usb at a time but only have one USB port on your laptop or PC.
In regards to the average usb port hub and how many ports are available, this can vary. The average usb port hub can support up to four usb inputs at a time.
A USB wire will always have a way to transport power. This wire in the USB wire will not necessarily be used all the time but it will always be there
Provided there is an open USB port and a headphone jack.
Up to 480Mbits/second, and being increased over time with improvements.
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Recharging Time : USB-based charging Approx. 4 Hrs(full charge),
old ones use LPT or Printer Port and new ones use USB
Well, if you have two separate devices, you can connect both to the USB drives in your computer (if you don't have enough, consider using a USB hub for less important devices, DO NOT use a USB hub for important hardware such as external hard drives, back-up hard drives, or anything along those lines as USB hubs will sometimes go unresponsive).