I need to expand the storage of my old PC. It is still using a 5 year old WD 500GB HDD. I need around 2TB of space for current (I need to transfer around 700GB from the 1 TB seagate external HDD as I'm giving this to my brother) and for future files. Now my question is should I get an external 2TB drive or an internal one?. I need to access this data (personal videos and stuffs) for twice or thrice a week and I need at least 5-6 years of lifetime for the HDD. If I store my data on external HDD and rarely use it will it increase the life span of the drive or should I get an internal one and store my data on it (because my current WD is old and have no idea when it will fail).