hi
i have to hard drives 1 a buffalo 1 tb external and a small usb stick, i used to use buffalo in windows pc but then got mac and since plugging it in mac it wont show in finder or anywhere else that i have looked for it, it does occasionally show up but when it does it asks me to format it but then wont allow format i can hear it work and when i plug in it gets the beep sound to say it has been plugged in but thats as far as it goes. any ideas how i can get it up n running again

thx