I need to add a larger HDD to store all my photos, movies, music etc and currently use a portable HDD.
If i bought a powered HDD instead of a portable one can i connect to my laptop with out being plugged into the socket and transfer like my portable HDD?
If you're asking whether you can use a desktop/powered HDD on USB power alone then the answer is generally no, although these days you may find one that supports the higher power delivery USB extensions like USB-PD that can deliver enough juice for a larger drive (provided your laptop port also supports it!).
Sorry, should have explained better but was heading to bed!
If i connect a mains powered HDD to my laptop to only transfer files, will that work? I have no issue with it being connected to a mains power source to connect into my tv, however where i sit with my laptop i don't have a mains connection close by so the convenience factor is gone.