HDD SSD
SATA 2.5" with max height of 9.5mm, minimal storage size 160GB (145 HDD models and 291 SSD models comply to that)
SSD can also be used, but it seems that on the PS4 there is even less incentive (compared to PS3) to replace the drive for a SSD, best price/performance are still 7200rpm drives.
- http://www.pcper.com/reviews/General-Tech/PlayStation-4-PS4-HDD-SSHD-and-SSD-Performance-Testing
- http://uk.ign.com/wikis/playstation-4/PlayStation_4_Hard_Drive_Speed_Test_Comparison
it is unsure if TRIM is enabled by default for UFS on the PS4, but on BSD in general it can be enabled with tune2fs -t enable : http://forums.freebsd.org/showthread.php?t=28004 see also : http://www.wonkity.com/~wblock/docs/html/ssd.html
on the standard 500GB (465.8 GiB) harddrive, there is 408 GB useable for the user, thus 57,8 GB is reserved for the systemfiles/filesystem.
Replacing the harddrive
Replacing the drive does not void warranty and can be done this way:
PS4 harddrive - image 01
PS4 harddrive - image 02
PS4 harddrive - image 03
Source: https://support.us.playstation.com/app/answers/detail/a_id/5107/kw/ps4%20harddrive
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