There are two reasons for this compatibility issue between the usb storage device and ps4.
Ps4 keeps saying usb storage device not connected.
Open device manager expand universal serial bus controllers right click usb root hub full steps.
Press and hold the power button.
Then go to your ps4 and plug into the flash drive once you have a plug in your flash drive go to the settings on your ps4 and click on application saved data management then press x on the saved data in system storage then copy to your usb storage device and now you go to each game and then select the data to the flash drive when you replace the hard drive then you have saved all your games in flash drive.
The usb storage device is not connected on ps4 another ps4 usb device connection issue is that when you connect your usb drive to ps4 but it s shown as not connected or ps4 keeps saying the usb storage device not connected.
If the ps4 can t recognize the usb storage device perhaps there s an error in the usb port in which the usb storage device is connected.
In most cases this error message only shows up with the usb storage devices used as an extended storage.
Try to switch to the next port and reboot the ps4.
To enter safe mode turn off the ps4 by pressing the power button.
Release it after you ve heard two beeps.
If your usb drive is plugged into ps4 but it s shown as not connected or ps4 keeps saying usb storage device not connected you should consider the compatibility between them.
Now check whether the update process would work or not.
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Right click windows icon and select power options change plan settings change advanced full steps.
This option updates the ps4 system software via direct download external storage device.
Connect the dualshock 4 controller with a usb cable that transfers data and press the ps button.