The Apple MacBook Pro Mid 2012 has an HDD storage media which is better than the SSD storage media found on most laptops that are a comparable age to it. HDD is a traditional storage drive which stores the information on magnetic disks. HDD drives are slower than other forms of storage such as solid state drives (SSD) and flash drives.
This laptop's storage medium (HDD) is actually the worst storage medium amongst all laptops of this age and type.
The best storage medium across comparable types of laptop is SSD.