In this regard, what hard drives are compatible with ps3?
The PS3 is compatible with just about any 2.5-inch SATA notebook hard disk. Both 5400- and 7200-RPM drives should work fine. The physical size of the hard disk is important because it has to fit the PS3's 2.5-inch drive tray.
Furthermore, are ps3 and ps4 hard drives the same? If you want a simple answer compared to what you've been given, yes. The PlayStation 3 HDD is the same type as the PlayStation 4, only differences are the speed ratings which doesn't entirely matter if you only plan on using the HDD for physical game updates as not all physical games need a huge install.
Beside this, can I just swap hard drives?
No, in most cases it won't work. Windows has all the device drivers and chipset drivers installed for the current system. When moving it to a different system, the OS will usually fail to boot. In some cases it can be fixed with a repair install.
Can a ps3 work without hard drive?
The PS3 will not work without a hard drive, but it's also designed to format the HDD automatically for PS3 use when you put it in and start the system up. The new hard drive would be formatted once you start it up with it in the ps3.
