Please tell us more about your computer, make, MB, other HDD's on the machine, and this new HDD, Manufacturer, Model #, size SATA II,III.
It's very unusual for a new 'raw' hdd to be write protected, unless something happened during partitioning and formatting.
What steps did you take to add a partition or file system, and is it assigned a Drive Letter?
You can't store any files on it, so you won't lose anything if it has to have its partition removed.
Go to Disk Management, and list for us in the lower graphical section what it says under the Drive Status box (Disk 1, Basic, size, Online) or whatever it lists, and below the dark blue band, the Volume Status section, (DriveLetter, size, NTFS, Healthy(Primary Partition) or what it lists. Also if there is more than 1 partition, list them. The info may be different, which is important.