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From: toddg@hpldola.HP.COM (Todd Goin)
Newsgroups: comp.sys.hp
Subject: Re: Disktab for Rewritable optical disk
Message-ID: <11870016@hpldola.HP.COM>
Date: 11 Sep 90 14:26:07 GMT
References: <1990Sep10.203556.29097@batcomputer.tn.cornell.edu>
Organization: HP Elec. Design Div. -ColoSpgs
Lines: 54

/hurf@theory.tn.cornell.edu (Hurf Sheldon) /  2:35 pm  Sep 10, 1990 /
>
>	We have an HP 650/A drive to try while our 20GB
>	disk farms are delayed - what disktab entry or
>	options to mkfs are appropriate? 

I use newfs /dev/rdsk/mo hpS6300.650A_noswap
(Don't forget you have to newfs both sides)
 
>	Any further info would be a help as we not only
>	 want to use it (on our 345) as a native disk but
>	 need to know if we can read the same media written on an
>	AlpaTronix PC Optical disc under DOS. 

Can't answer this one.

>	Our system is a 345, HP-UX 7.0 - the media says
>	hp92280A on it. -1024 bytes/sector.
>	How many sectors?

Info from the /etc/disktab file:

###############################################
# The HP Series 6300 model 650/A is a Magneto-optical
# drive with 2 surfaces and uses the SCSI interface.
# The mechanism can only access one surface at a time.
# The media is removeable (5.25"), with an estimated
# minimum shelf life of 10 years. Media has a write-protect tab.
# Total formatted capacity: 322.1 MBytes / surface; 644.2 MBytes total
# Physical Geometry:
#       Bytes / sector    1024
#       Sectors / track   17
#       Cylinders         18504+

>	Do I use the same major/minor numbers as the
>	SCSI disks (330's)?

ll /dev/dsk/mo yeilds:

brw-r----- 1 root  sys  7 0x0f0000 Jun  8 07:55 /dev/dsk/mo

>	
>	Q: DOes the 20GB farm use the same format as the 
>	   650/A?

I hope so, but cannot answer for sure.

>	Thanks in advance
>	Hurf Sheldon
>
>     Hurf Sheldon		 Network: hurf@wisdom.graphics.cornell.edu
>     Lab of Plasma Studies	  Bitnet: hurf@CRNLION
>     120 Rand Hall, Cornell University, Ithaca, N.Y. 14853  ph:607 255 6713
>