Review the contents of the second image.
HDD Hacker only supports Western Digital Scorpio drives.You are trying to write a modified firmware to an unsupported HDD, so it will fail.
The largest theoretical size that the console can support is 2 TB. However, on unmodified retail systems, there are limitations.
It's a security measure, you can read more here:
http://fatxplorer.eaton-works.com/security-sector-informationSo in short, you need to use a supported HDD and you cannot have a size bigger than 320 GB currently. You can buy a 321+ GB WD drive, but the console is only going to let you use 320 GB, as defined in the Security Sector.
Feel free to post anymore questions.