2TB disk? If you use a real Z80, you can probably run that in append-only mode for the rest of your life. Writing full time at 100kB/s would produce about 9GB/day, filling up that disk in about 6 years. Producing and writing 100kB/s isn’t realistic for a Z80 at <10MHz, though (10 cycles/byte seems to be the best for memcpy, and you would need to generate data, and drive that disk, too. See https://retrocomputing.stackexchange.com/questions/4744/how-...)