One of the best features of the PlayStation 4 is the ability to upgrade the hard disk drive (HDD) with any compatible size of HDD, without voiding your warranty. So it’s no wonder that people have probably already swapped out their HDDs with a bigger one the moment the PlayStation 4 was in there hands. However, if you’ve downloaded loads of games on the stock HDD, and then downloaded different games on the new HDD, don’t think that you will be able to swap the hard drives back and play the other games.
That doesn’t work. You will get a message asking you to reformat your HDD, and have to re-download everything again, because Sony’s security policies imprint one specific HDD on the PS4 console at one time.
So if you’re thinking you can give the PS4 to your friend to borrow it, and just take the HDD out so he can use his own, or if you’re thinking you can store half your games on one HDD and half on another, think again. Luckily if you’ve got PlayStation Plus, you won’t lose much data as it automatically uploads save data to the cloud, so you can start playing right from where you left off when you’ve downloaded everything again.