You can.
no
yes it is
No, you cannot play Xbox 360 games directly on an Xbox console using a flash drive. Xbox 360 games must be played on an Xbox 360 console or an Xbox One/Series X|S that supports backward compatibility. Additionally, while you can use a flash drive for storing game data or saves, the actual game files need to be installed or accessed properly on the compatible console. For GTA V, it must be installed on a compatible console to play.
You can't transfer files on xbox 360 using a usb thumb drive, but you can if you buy a xbox 360 memory card
yes, you can. you can copy music to the xbox 360
No because xbox do not have windows
no you could use modio for your xbox 360 with a flash drive
You can format and use a USB flash drive as an Xbox 360 storage device and store up to 2 terabytes (TB) of content.
Yes you can flash any xbox 360 just be careful as to what games you play so you do not get banned.
because your xbox 360 hates you
For Grand Theft Auto: V, there will be an initial install on Xbox 360 that will require an Xbox 360 Hard Drive or an external 16GB USB flash drive with at least 8 GB of free space. If using a USB flash drive it must be at least USB 2.0 with a minimum 15mb/s read speed and formatted for Xbox 360 use. A new USB flash drive is recommended to ensure optimum performance.
You have to flash your 360 to play backups