Fortunately, there is a file system (actually two, I’ll explain) that you can format your flash drive to be fully compatible with Mac and PC. In other words, you can access the drive and transfer data without any hassles. That file system is — exFAT. If you have an old flash drive or one that was formatted to work with Windows or another operating system, you can still format your flash drive to work on a Mac. Volume Format Most manufacturers use the FAT 32 or MS-DOS (FAT) volume format. On the left side of the window are the drives connected to the computer. Select the capacity of the drive respective to the one containing the device you wish to format then click the Erase tab. Example: If the drive is called 'NO NAME', directly above that, you should see the drive capacity of 'XXXX'. Select this capacity. 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).
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.)
Format Flash Drive-in Mac
Aug 23, 2008 1:22 PM