|As Phill says, primary partition is not your problem.|
I think you are misunderstanding what a primary partition is. Every drive can have a maximum of four portions. Every one can be a primary partition, or three primary partitions and one extended partition.
I have an Internal drive and an external drive. Each is partitioned with two primary partitions, making four primary partitions I can access.
Every drive has to be partitioned and a primary partition is the obvious one to use. The only other alternative is an extended partition and that brings in unnecessary complications.
Once a drive has been partitioned, it then has to be formatted, usually to NTFS.
If you can see the partition in Windows Explorer but no files then I would check your backup procedure. Something went wrong
message edited by StuartS