Hi!
if you use Windows XP or earlier, then - right click on your flash drive, goto "properties" -> uncheck "read only" checkbox.
If you use Win 7 or Vista - then use administrator account to run format (shift+right click on program, choose "run as administrator" ). the easiest way in Win7/Vista to format your flash drive is: Start -> all programs -> Accessories -> shift+right click on command prompt -> "run as administrator" -> type fromat driver_letter /q /y and press enter (e.g. if your flash driver has letter z, then you need to type format z /q /y and press enter). This will quickly format your flash drive.
If you use Linux/Unix/MAC OS, then you can use
GParted or following command in terminal:
1. su
2. Enter password when asked
3. fdisk /dev/your_flash_drive_name (e.g. dev/sda/)
mkfs -t vfat /dev/your_flash_drive_name
Hope that will help :)
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