I saw many people telling its not hackable
Not hackable on an individual forefront.Bitcoin core runs on a peer to peer network ,there is always a insecurity someone might just disrupt the network and maybe it will affect your computer in some or the other way .
Thanks mates, will try the - prune option, by the way is this the most secure and less hackable bitcoin wallet out there, it appears this to be by reading in the forum. I may switch from Multibit to this one especially now that multibit is being sold to keepkey.
Choose Electrum over multibit.In multibit at times you will have to reload the blockchain over and over so it remains in synch.Electrum is hassle free.