X3T9.2/89-068






Marilyn Kornfeld
X3 Secretariat
311 First Street, N.W.
Suite 500 
Washington, DC   20001

May 5, 1989

Dear Ms. Kornfeld,

Maxtor Corporation offers the following comments on the ESDI revision 3 
document (X3.170-198x).

1) The note on page 138 of Appendix K.1 seems to contradict the description of 
master mode and master control mode in K.3 on page 139.

2) The set configuration command would be more useful if there was a way to 
specify an unsynchronize mode as in the SCSI-2 document.  There is a code 
available that could be used for this purpose.  Can this feature be added to 
the ESDI document?

3) The output of the SLAVE SYNC and MASTER SYNC pulses is not clearly defined 
for all cases.  Does a drive operating in master mode output just a SLAVE SYNC 
pulse or does it output a SLAVE SYNC pulse and a MASTER SYNC pulse?.

4) The method of using rotation offset when operating in master control mode 
is not described.  The SCSI-2 standard specifically states that rotation 
offset is not supported when in master control mode.  Can the ESDI document be 
clarified on this point?

5) In section 7.18.3 on synchronized sector offsets it is not clear whether 
the offset is advanced or retarded.  Can the ESDI document be clarified on 
this point?



Best Regards,





Mark S. Rice
Maxtor Corp.
211 River Oaks Pkwy
San Jose, CA 95134