China DOS Union

Guidance from DOS experts needed: under XP I still can't get into DOS. I tried a lot of so-called boot disks, and after rebooting I still couldn't get into DOS ? I want to ask:
1. There are many Chinese boot disks around, so which Chinese DOS boot disk is actually powerful and easy to use?
2. Some people say I need to enter the BIOS settings. So how do I enter the BIOS settings?
3. I tried a lot of so-called boot disks, and when I followed the method to make a floppy disk, it always said there wasn't enough space on the floppy. Files of 1.4M just won't fit onto the floppy, and after formatting, a very ordinary floppy only has 1.38M. What's going on? Thanks!

A floppy showing as 1.38M after formatting is due to the calculation method; in reality it is 1.44M.
As for which boot disk is powerful and easy to use, that depends on the individual's needs. Each should have its own strengths.
As for the BIOS settings you mentioned...... I suggest you take a good look at other people's posts. These questions have already been answered many times...