Format c:/
Most people couldn’t afford a hard drive in those days (1983).
I remember when I was finally able to get an IBM clone with a 10 Meg drive that was full height MFM encoded. Chris Fisher, workplace genius, told me to use “debug” to execute the command line program on the controller at memory address C800 or *something* like that. I was able to change the interleave and went from like 10 revolutions to read a sector to only 4. Made a huge diff in the performance.
I thought that 10 Meg. was more space than I would ever need.