HDD SSD
2.5" with max height of 9.5mm, minimal storage size 160GB
SSD can also be used, but it is unclear how much the PS4 can benefit from this (comparison of HDD/SSD on PS3 : http://www.gtpla.net/wp-content/uploads/2010/12/Hvx2a.png)
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
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. See also here: http://www.pcper.com/reviews/General-Tech/PlayStation-4-PS4-HDD-SSHD-and-SSD-Performance-Testing
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