After Low level format or zero fill, if your hard disk drive is not working properly or still has any mechanical problem, then try zero filling the hard disk drive using third party software if not replace the hard disk drive.
Always remember to take backup before zero filling the hard disk drive and never zero fill unless there is very good reason to do so.
Seagate HDD (Hard Disk Drive) Tool
Click here to download Zero Fill tool for Seagate hard disk drive. Same tool can also be applied for Maxtor Hard Disk Drive.
Western Digital HDD (Hard Disk Drive) Tool
Click here to download the tool by selecting specific hard disk drive model.
Samsung HDD (Hard Disk Drive) Tool
Hitachi HDD (Hard Disk Drive) Tool
Free Zero Fill Tool
This is a free utility which supported Maxtor, Hitachi, Seagate, Samsung, Toshiba, Fujitsu, IBM, Quantum, Western Digital.