ATT6300+ hard disk--physical reformat??

[Bob Krick]

I need some information to do a low-level, physical reformat of the hard 
disk in an ATT6300+.  The system has the original 20Mb drive (ST225) and 
controller (Western Digital).  The BIOS is v1.04 and I am running DOS3.3.

Is there a routine in ROM for physical formatting the hard drive?  If so,
what is the starting address for running the routine with DEBUG?  Or, do 
I need the "System Diagnostics Disk" which I don't have?  If so, where 
can I get the disk or program?  

=========================================================================
        Robert F. Krick  		PHONE: (919) 684-3123 x61
    	Dept. of Electrical Eng. 	CSNET: rfk at dukee
    	Duke University			UUCP:  decvax!duke!dukee!rfk
        Durham, NC    27706  		ARPA:  rfk at dukee.egr.duke.edu
=========================================================================
        Robert F. Krick  		PHONE: (919) 684-3123 x61
    	Dept. of Electrical Eng. 	CSNET: rfk at dukee
    	Duke University			UUCP:  decvax!duke!dukee!rfk