Ok, so I put the hours in I feel I deserve a thread about this...these are my findings, they are not scientific but hopefully this will help some folk...this is version one, happy to listen to feedback and improve
Things you need to know;
1) Activating a PS4 as primary actually activates the HDD
2) You can switch your old HDD back in case you forgot to do something so keep it for a few days at least
3) A direct transfer of data via Ethernet is quicker but I had no end of issues so I suggest backing up to an external HDD after pruning unwanted data
Things you will need;
1) Small cross head screwdriver
2) A UBB stick (2gb)
3) A USB lead (for connecting the DS4)
4) An external HDD
Follow these steps;
1) Download the latest version of re-installation firmware (https://www.playstation.com/en-us/support/system-updates/ps4/#newinstallation)
2) Format USB stick in exFAT (Not NTFS)
3) Place the file in the following folder structure; PS4>UPDATE
4) Sync your trophies (go to the 'Trophies' menu and it will autosync)
5) Deactivate primary accounts
6) Delete anything you don't need or can install easily once migration complete
7) Backup your data via to an external HDD (formatted in exFAT) via Settings>System>Backup (250gb took around 2-3 hours)
8) Shut down PS4 and replace the HDD (https://www.youtube.com/watch?v=RXhtFP5RFdI)
9) Insert USB stick and connect DS4 via USB lead
9) Power on PS4 and select to install the new firmware
10) Once installed go into Settings>System>Restore backup (again, a 2-3 hour wait per 250gb)
11) Make PS4 Primary and enjoy your new HDD!
Now onto my results so far - stock on PS4 to follow;
Edit;
Did some SSHD tests, GTAV, U4, LoU and RotTR all (after repeat loads) got very similar to SSD speeds. I then went back to GTAV and then U4 and both stuck to the fastest time. I switched the machine off fully and then rebooted into GTAV and the time was still on par with SSD times.
The only down side to SSHD is that it takes a few loads to get these times so if playing a game which loads areas as you progress you won't get the initial fast load but certainly it's very impressive bang for buck.
Things you need to know;
1) Activating a PS4 as primary actually activates the HDD
2) You can switch your old HDD back in case you forgot to do something so keep it for a few days at least
3) A direct transfer of data via Ethernet is quicker but I had no end of issues so I suggest backing up to an external HDD after pruning unwanted data
Things you will need;
1) Small cross head screwdriver
2) A UBB stick (2gb)
3) A USB lead (for connecting the DS4)
4) An external HDD
Follow these steps;
1) Download the latest version of re-installation firmware (https://www.playstation.com/en-us/support/system-updates/ps4/#newinstallation)
2) Format USB stick in exFAT (Not NTFS)
3) Place the file in the following folder structure; PS4>UPDATE
4) Sync your trophies (go to the 'Trophies' menu and it will autosync)
5) Deactivate primary accounts
6) Delete anything you don't need or can install easily once migration complete
7) Backup your data via to an external HDD (formatted in exFAT) via Settings>System>Backup (250gb took around 2-3 hours)
8) Shut down PS4 and replace the HDD (https://www.youtube.com/watch?v=RXhtFP5RFdI)
9) Insert USB stick and connect DS4 via USB lead
9) Power on PS4 and select to install the new firmware
10) Once installed go into Settings>System>Restore backup (again, a 2-3 hour wait per 250gb)
11) Make PS4 Primary and enjoy your new HDD!
Now onto my results so far - stock on PS4 to follow;
Edit;
Did some SSHD tests, GTAV, U4, LoU and RotTR all (after repeat loads) got very similar to SSD speeds. I then went back to GTAV and then U4 and both stuck to the fastest time. I switched the machine off fully and then rebooted into GTAV and the time was still on par with SSD times.
The only down side to SSHD is that it takes a few loads to get these times so if playing a game which loads areas as you progress you won't get the initial fast load but certainly it's very impressive bang for buck.