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Definition: storage hierarchy


The range of storage technologies within a computing device. The following list starts with the slowest and ends with the fastest. Also included is the memory hierarchy. See storage, memory and storage vs. memory.

     **STORAGE**

 Very Slow
 Punch card (obsolete)

 Paper tape (obsolete)

 Fast
 Bubble memory (obsolete)

 Floppy disk (obsolete)

 Much Faster
 Magnetic tape

 Optical disc (CD, DVD, MO, etc.)

 Magnetic disk

 Fastest
 Flash memory (SSD, USB drive)



     **MEMORY**

 Main memory (DRAM)

 High bandwidth memory (HBM)

 Cache (SRAM)

 Microcode

 Register