China DOS Union

I tried for several days. DOS 7.10 seems to work, but DOS 6.22 can only be installed on the first primary partition of the first hard disk.
Is that correct? Experts, please give your opinions.

I set the first primary partition to 7.2G, installed winxp on it, in ntfs format; set the second primary partition to 0.5G, installed dos6.22 on it, in fat format.

Booted from the DOS 6.22 floppy drive, ran sys c: and set the second primary partition active.
But DOS 6.22 still cannot be booted from the hard disk.

MS-DOS6.22 must be installed within the first 2GB of the hard disk, otherwise it cannot boot

Is this statement correct?????

I suggest you do these tests yourself in a virtual machine, that way you'll get a clear result.