hi, i just got a HDD today, i ordered it online, i connected my HDD to my iMac and i had it format. Later on today, i had to use it on my Windows machine, and it asked me to format it which i did, but now my HDD is messed up i think. It will no longer format and when i open disk utility it reads it, but as i try to format it formats and then i try to check for disk errors, it gives me errors, adn then it asks me to repair the disk. i do, but my iMac tells me it cannot repair the disk. i tried using the OSX installation disc as well. i even tried formatting the HDD on my Windows using the My computer> Manage Disk....no good... i get a message saying it was unsuccessful. what's wrong and can this be fixed?