yes, pen-drive is a peripheral device.
Yes it is.
In essence, a pen drive is device with an integrated memory card and a USB plug.
Because God commanded Man to do so.
Pua Khein-Seng is the father of pen drive, he developed a storage device and gives name USB Flash drive. USB is the common name of pen drive. You can save data according to the size of pen drive. Pen drives are available in deference range of size such as 2gb, 4gb, 8gb,....1tb.
To removed write protected mode from your usb pen drive you must first reboot your device when your device comes back on press f8 frantically. This will prompt your device to advance settings, let your files load and than rename your pen drive and hit enter after that hit enter again when asked about the formatting of your new drive, press yes when the prompt appears, allow your system to reboot, this may take some time but after rebooting your pen drive will be removed.