I'm brand new to Mac Book Pro and have used PC's for years. So this may be a stupid question. Using Finder I can copy/paste files from my flash drive to the Mac, but I cannot copy from my Mac to the flash drive. Why?
Open Disk Utility (in Applications/Utilities). Select the flash drive in thesidebar (the top entry for it). Click on the 'Erase' tab in the main pane. Type a name in the 'Name' field. Set the Format to 'MS-DOS (FAT)'.
Your flash drive is probably formatted to NTFS which Macs can read but not write to. If you reformat it to FAT32 then both Windows and Mac will read from and write to it.
This thread has been closed by the system or the community team.
You may vote for any posts you find helpful, or search the Community for additional answers.
Cannot copy to USB Flash Drive
Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.