99% of machines use standard ATA drives. The machine boots off the master (C) drive. The boot.ini file tells the system whther you have an ATA drive or SCSI drive, which drive to go to, and which partition on that drive.
Machines with SCSI controllers can boot off any drive. SCSI(x) refers to the SCSI ID (1 to 8 ir 16 depending on the SCSI type) of the drive containing the operating system (they don't operate on the basis of primary/master).
If you had a SCSI drive, you'd know about it. You haven't, forget it. You use ATA.
Search for the file "boot.ini in the root C: directory using wordpad.
Here's mine:
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect
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Timeout is how long the machine shows the information on the screen during boot-up.
The rest is standard for an ATA HDD. It's telling the machine to go to the master ATA drive with the active partition. The only thing which might change is whether you have XP home or professional.
Just copy the file from your PC to the floppy after you've formatted it and copied the system files to it.