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#1
Nothing really. I used to have 5 hard drives and a few of them separated into 2 or 3 partitions. My power requirements went waay up however so I eventually updated to one large (TB) hard drive with 2 partitions and an extra drive to store backup images.
The OP is asking why the drive labels are not consistent from Device Manager to Explorer.
In Explorer, Right Click the drive and choose rename. If the name does not persist after boot, please report back.