My 1 tb Seagate external hard disk is corrupted. when I try to format, it shows "windows is unable to format the drive". I tried the check disk option but while creating a partition, it gets stuck at 0%.i tried formatting using disk management,i succeeded but while using, it gets way too slow and stops responding. It doesn't have any data.what should I do to make my hard disk as it was before ?? Any external softwares ??