i bought an external hard drive for my ps4

Drive Partition and Format - El Capitan or Later

1. Open Disk Utility in the Utilities' folder.
2. After Disk Utility loads select the drive (out-dented entry with the mfgr.'s ID and size) from the side list. 
3. Click on the Erase tab in the Disk Utility toolbar. A panel should drop down.
4. In the drop down panel set the partition scheme to GUID. Set the Format type to APFS (SSDs only) or Mac OS Extended (Journaled.)
5. Click on the Apply button and click on the Done button when it is activated.
6. Quit Disk Utility.

Drive Partition and Format - Pre-El Capitan

1. Open Disk Utility in the Utilities' folder.
2. After Disk Utility loads select the drive (out-dented entry with the mfgr.'s ID and size) from the side list. 
3. Click on the Partition tab in Disk Utility's main window toolbar. 
4. Set the number of partitions to one (1) from the Partition Scheme drop-down menu.
5. Set the Format type to Mac OS Extended (Journaled.)
6. Click on the Apply button.
7. Quit Disk Utility after the process is completed.