The two different types of hard drive trays for the original model PlayStation 4
There are two different variations of the tray that hold the internal hard drive inside the original model PlayStation 4. This will slightly alter the process of upgrading the PlayStation 4's internal hard drive.
The first variation has an open face and when the drive is inserted, its label will be visible.
Image from WestinGames.comThe second variation has a closed face and when the drive is inserted, its label will not be visible.
Image from AliExpress.comIn both methods, the drive will be inserted into the system with the drive's label side up. With the second type, however, the label will not be visible.