Who remembers their first computer? Mine was a Heathkit that you had to put together yourself. At the time it had no storage and used Motorola machine code. Once you turned it off you lost everything. Later they came out with an interface to a tape player so you could save your programs. This was early to mid 70's. Later I upgraded to a TRS 80 that had a 5 1/4 in disk drive. Later they came out with an external hard drive called a Winchester disk. I would hold 5 meg and it had a key that you could used to write protect it. It used CP/M as the operating system which was "borrowed" by Bill Gates later to become MSDOS.