For this you need to head over to Settings > Devices > USB Storage Devices > Format as Extended Storage. When connected to PS4 the Hard Drive or the USB should be formatted to start transferring the data. The right PS4 USB drive format is a must. Along with the right USB format for PS4 USB interface should be 3.0 as the lower versions are too slow to read and write the data to or from PS4.The integral part is the PS4 flash drive format. To make sure that the best performance is achieved once the USB has been attached to the system you need to make sure that the following requirements are met. The slot space is too limited when it comes to PS4 so you must buy an external wire or cable if the USB has a weird design. The USB design should be such that it easily attaches itself to the slot. Certain requirements are to be fulfilled. Therefore you can easily use a USB or external hard drive with the console with the right PS4 external hard drive format. PS4 comes with an external slot for the USB connections. Bonus Tips: How to Recover Lost Data from PS4?.Part 3: How to Format an External Hard Drive for PS4?.Part 2: What's the Best Format Should a USB Stick be for PS4?.Part 1: Can I Use a USB Stick on My PS4?.