Since my 250 GB HDD is constantly running full, I decided to buy me a new external HDD. Since I am satisfied with the old one, I once again took a "My Book" by Western Digital.
Now I have 931 GB* of space for more TV Shows.
* HDD people calculate with the base of 10 to the power of n, while Computer people and operation systems calculate with the base of 2 to the power of n. So for a HDD manufacturer 1TB = 10^12 Byte = 1,000,000,000,000 Bytes, while in reality this amount of bytes comes up to only 931.323 GB.