Formatting a USB flash drive for Mac OS X Leopard & Windows XP

I'm pretty new to Mac, so forgive me if this seems a very basic question.
How do I format a USB flash drive so that it can be seen by both an Imac running Mac OS X Leopard and a PC running Windows XP?
If one or other machine can't see the drive it makes transferring files really frustrating.
Your advice would be appreciated.
Thanks.

You can either use Windows or OSx to format the flash drive to FAT32. This will allow you to read and write from OSx and Windows. If you just bought the flash drive then double check before you format as it may already be formatted to FAT32.
Use Disk Utility from OSx to format your flash drive OR from windows, click on *My Computer* and then highlight the drive letter and choose File from the top menu and then Format.
Axel F.

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