Format Flash Drive Mac Fat32

If you're moving it between Mac and Windows, you want to format your flash drive with the FAT32 filesystem. It shouldn't matter whether you format it on your Mac or on a Windows machine.
To do it on the Mac, plug in the flash drive, and open Disk Utility (in your /Applications/Utilities folder). The drive should appear in the list on the left of the DU window.
Select the drive, then click the Erase tab. On that tab, select MS-DOS (FAT) as the volume format, choose a disk name if you want to, then click Erase, and wait.
That said, if your drive just 'didn't work any more' after a while, it may be faulty and it's possible that re-formatting it won't help. (All flash drives do have a finite number of read/write cycles before they don't work reliably any more, too, although it's unlikely you've reached that limit through normal usage.)

Launch Disk Utility. Connect the USB flash drive to your Mac. If there are any files on the drive you. Most external hard drives and USB drives are compatible for use on Mac computers as long as you format the devices for use with Mac OS X. USB drives can be formatted on your Mac using the Disk Utility application.

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