Many late Pentium era BIOSes let the bootup drive be switched. This means that you can install an OS on each hard disk and whenever you want to change OS simply enter the BIOS and change the boot order. Restart the system and you should be in the OS you chose. With DOS's need to have the boot partition be at the front of the disk, separate drives are much easier than relying on boot managers and multiple tiny partitions that get hidden.
For DOS 6.22, setup is easy. With FDISK, create a primary partition of less than 2 GB. Then create an extended partition containing the rest of the disk. Inside the extended partition, create logical drives (each less than 2 GB) until you run out of disk space or get tired of creating logical drives. Then install DOS and format the drives as needed.
DOS 5 uses a similar procedure except that according to some of my sources, the primary partition and each logical drive has to be smaller than 512MB so you might have 8 logical drives.
With 2 disks after fully partitioning and formatting both, you might see something similar to the following:
DOS 6.22: Drive C (2 GB primary partition DOS 6 is installed on); Drive D (512 MB primary partition with DOS 5); DRIVE E (2 GB logical drive on the disk DOS 6 is installed on); DRIVE F (the rest of the disk DOS 6 is installed on, about 200 MB); Drives G through M would all be 512 MB logical drives on the disk with DOS 5; and Drive N with the remainder of the space of the disk DOS 5 is installed on.
DOS 5 won't be able to read the DOS 6 drives except for the small logical drive at the end. The highest drive letter would be L.
I would have to do some testing. I am not sure if DOS 2 or DOS 3 will be able to work with such a large disk. If you create a primary DOS partition of less than 16MB with DOS 5 or 6, DOS 2 or 3 should be able to format the partition if the drive can be worked with.
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