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From: sigma!sea375!dave@quick.com (David A. Wilson)
Newsgroups: comp.sys.nsc.32k
Subject: Re:  9380S disk format question
Message-ID: <9011150220.AA13087@sea375.UUCP>
Date: 15 Nov 90 02:20:08 GMT
Sender: news@daver.bungi.com
Lines: 51
Approved: news@daver.bungi.com


This is how I do it for a cdc4702n(702MB unformatted) disk, I think it
should work in general.

1. Formatting from scratch

	a: set block size:

		SCSI cmd bytes(hex)
			15	Command=Mode Select
			11	PF=1, SMP(save parameters)=1
			00
			00
			0C	Parameter list length
			00
		SCSI data bytes to write(hex)
			00	Mode select hdr
			00	Medium type
			00
			08	Block descriptor length
			00	Density code
			00	|
			00	|- # of blocks(0=all)
			00	|
			00
			00	|
			xx	|- block size for format
			00	|
		
		Where xx is: 10=4096, 08=2048, 04=1024, 02=512, 01=256.

	b. Format Drive

		SCSI cmd bytes(hex)
			04	Command=Format unit
			00	Defect list mode
			00
			00	|- Interleave(default[0] means 1:1)
			00	|
			00
		# of SCSI data bytes to read(decimal)
			8
		
		I don't think read bytes are needed, but it didn't hurt.


====== I hope this is useful

	David A. Wilson
	dave@sea375.uucp
	...uw-beaver!uw-entropy!quick!sigma!sea375!dave