The solution is to disable write caching on the usb hdd in device manager.
You can choose in the disk properties for optimize for quick removal or optimize for performance. CHOOSE optimize for quick removal.
Backup the files and try reformatting it with NTFS with the disk manager of your operating system.
Im having the same problem,. when ever I tried to initialized disk at computer management, it always says that the disk is write protected. I can not format it. I can not open it or I can not do anything to it. I try what you have said here but I can not find that write caching in the usb hdd device manager? please give me some help too.. thankz