if the HDD should fit in the chasis without modding 2TB ... i have my Fat-PS4 system chasis moded and now a 4TB Hybrid HDD do it work
I have an Seagate Barrcuda 8tb extertnal 3.5" hard drive with my slim active as a Hybrid . I have used a male to female sata cable connected to the internal sata interface. It uses an external power supply for power as there is not enough current from the internal interface. After the software installation I have 7.20TB free.... I just installed it in an old housing I had.
Looks a little messy at the moment but will tidy it up shortly. The is NOT a USB external hard drive.