In case of your storage hard drive not found, the very first thing that needs to be determined is whether this problem is due to the connection or the hard drive. You can check the USB cable, power cable, and the computer port for this purpose. Try connecting the hard drive to another computer as well. In case of Windows, you should check Disk Management, where the hard drive will be shown either without a drive letter or with an unallocated partition. You should not create a partition and format the hard drive prior to checking it for any important file.