There are a number of types of digital memory available, such as hard disk drive (HDD), random access memory (RAM), solid state drives (SSD) and cache memory. Is there an advantage to having multiple...

There are a number of types of digital memory available, such as hard disk drive (HDD), random access memory (RAM), solid state drives (SSD) and cache memory. Is there an advantage to having multiple standards or would it be beneficial to consumers if there was only one memory standard, such as just the various sizes of SSDs? Would having a single standard be less expensive and more convenient for consumers?