Hi, I have a USB external hard drive in which I formatted with the Utility on my iMac to MS-DOS (FAT) Am I correct in the understanding that this external drive can now be used by both my iMac and my Windows Vista PC? I want to be able to share the files (whether it be documents, photos or video) on the external hard drive with both my iMac and PC. Additionally, is this type of formatting as stable as any other format? I am just concerned about losing any data long term. I will be backing up my files on two separate external drives using the same formatting. The duplication is in case one of the external hard drives crash. I am a little paranoid about Hard Drives crashing since my iMac HD crashed after only 7 months. Glad I purchased that extended warranty!