Hmmm.. judging from the questions you are asking, I would suggest you do NOT try to do any flashing in DOS untill you understand the basics, or you will end up w/ a dead drive (or system).
Use Google (or other search) to look for "dos boot disk" and read up on how they work. Might want to read up on using the command line as well.
There are many .bin file formats, not just the ones that are CD images. In this case, it's a binary file type. This is the firmware binary image that will be written to the drive's EEPROM (much like the BIOS of your computer)
Once you understand making boot disks, using command line parameters in DOS, and how flashing a firmware works in DOS, then go ahead and do it, AFTER you make a backup of your current firmware (asuming it is working).