[quote][b]Intro[/b] Lots of posts on the PS4 hard drive (HDD) right now, so I wanted to consolidate this info and share my experience. Hope this helps. The PS4 is shipped with a standard HDD running 5400 rpm to keep costs, heat, and noise down. To those looking at putting in extreme RPM drives (10k+), I would strongly discourage it. [b]Basic PS4 HDD Info[/b] • Make: HGST • Size: 500GB • RPM: 5400 • Form Factor: 2.5 inch [b]Upgrade Options[/b] • Type: SATA based 2.5 inch laptop HDDs • Height: Between 9mm and 12.5mm • Prices: At the time of writing, the sweet spot is 1.5TB drives (in my option). There is essentially no premium on larger drives right now, they're running about $40 per 500GB (or thereabouts) • This is the largest drive I can find right now: 1.5TB HGST (9.5mm high) @ $125 - http://www.amazon.com/gp/product/B00EDIU5IW [b]Performance[/b] • Higher RPM doesn't mean faster load times. Platter size (the disks that are inside the HDD) play an equally important role. Here's a quick rule of thumb; 1) Drive size, 2) RPM, 3) cache, in that order. For example, a 1.5TB 5400RPM will have higher performance than 500GB 7200RPM. • To go a little deeper; if you have 4 platters in a HDD and the size of Drive A is 500GB and the size of Drive B is 2TB, then Drive B has a higher platter density (125GB vs 500GB). That means the HDD has to do less work to grab data because wherever the "head" reads the disk ("grabbing" data off the platter), it's going to "grab" more data per read from Drive B than from Drive A. • Hybrid drives (large HDD mixed with a small SSD) doesn't suffer from TRIM concerns, but may not be much of a performance boost unless you play the same game regularly. They get their speed by caching common files in the smaller SSD section, but they're usually not bigger than 8GB. For reference, Killzone:SF looks to be a 40GB install. [b]Warnings[/b] • PS4 does not appear to currently support TRIM. If it does support TRIM, it's yet to be validated. This means that if you install an SSD drive, it will likely suffer from seriously degraded performance that it wont be worth the additional investment. [b]TL;DR[/b] • The best bang for your buck HDD for performance, cooling, and size will be a big 2.5 inch HDD. The biggest right now is 1.5TB (see above). If you've got extra cash, pop for a Hybrid drive but be aware these are untested right now (and caching probably will happen for OS files). Avoid SSDs until the PS4 is confirmed to support TRIM.[/quote] Taken from the PS4 subreddit. Consolidation of all currently known info pertaining to the PS4 HDD.