#DOS USB KEY HOW TO#
#DOS USB KEY UPDATE#

# newfs_msdos -B /full/path/to/bootsect -o 63 /dev/da0s1 Take note of the start offset of the partition you created above. Veering off from these instructions may cause the file system to be created incorrectly. It's important that you follow the next few steps precisely. Step 3: Create file system and system boot filesДecompress the attached bootsect.gz file: I'm also using the basic, active partition chainloading boot manager at /boot/mbr, but you could try /boot/boot0 too. If you experiment with the size you might need to adjust the partition type. I'll be creating a 64 MB FAT16 partition. # dd if=/dev/zero of=/dev/da0 bs=1m count=2 A bootable DOS floppy image, or any source of io.sys, msdos.sys, and (an MS-DOS 6.22 image from is one option).

#DOS USB KEY HOW TO#

For simplicity I'll only be showing you how to set things up with your DOS partition at the beginning of the disk, but feel free to experiment.ДЄll commands assume your USB disk is at /dev/da0. There are some limitations with DOS in that its boot partition can't start beyond a certain offset on the disk. So the first thing you need to do is setup your MBR and partition table. By setting up your USB stick like this you could even have multiple OSes installed with a boot manager to select between them, or just have a small DOS partition and another for your normal data. The other difference is that hard disk partitions can be much larger than 1.44 MB. One key difference between a hard disk and a floppy disk in this context is that the hard disk has an MBR and so can have multiple partitions - one for your bootable DOS image, another for the rest of your USB stick. So I decided to figure out how to create a bootable DOS hard disk manually.

#DOS USB KEY UPDATE#

I've had more than one occasion where a firmware update simply couldn't fit into 1.44 MB, even after deleting everything but io.sys, msdos.sys, and. The other problem is that a lot of these guides are written for Windows.

A USB stick that is useless for anything else unless you reformat it.

A DOS file system that can never hold more than 1.44 MB of data (ok, 2.88 MB if you manage to find a 2.88 MB image file).

The problem with that is that you're stuck with two things: There are a number of guides online that show one how to create DOS bootable USB floppy disks, but these all follow the same theme:

Dos usb key