[comp.sys.hp] Disktab for Rewritable optical disk

hurf@theory.tn.cornell.edu (Hurf Sheldon) (09/11/90)

	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? 
	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. 
	
	Our system is a 345, HP-UX 7.0 - the media says
	hp92280A on it. -1024 bytes/sector.
	How many sectors?
	Do I use the same major/minor numbers as the
	SCSI disks (330's)?
	
	Q: DOes the 20GB farm use the same format as the 
	   650/A?



	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
     

rjn@hpfcso.HP.COM (Bob Niland) (09/11/90)

re: hurf@theory.tn.cornell.edu (Hurf Sheldon)...

>	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? 

###############################################
# 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
# 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+
hpS6300.650A|hpS6300.650A_noswap|HPS6300.650A_noswap:\
        :No swap:ns#17:nt#12:nc#1542:\
        :s0#314568:b0#8192:f0#1024:\
        :se#1024:rm#2400:
#####################################################
# It is not recommended to use the 650/A drive as the
# root device.  For convenience an entry is provided
# in case the user requires it for special situations.
hpS6300.650A_32MB:\
        :32 MBytes swap:ns#17:nt#12:nc#1381:\
        :s0#281724:b0#8192:f0#1024:\
        :se#1024:rm#2400:

>	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 help you there. If the Alpa is not "Continuous Composite", forget it.
	
>	Q: DOes the 20GB farm use the same format as the 
>	   650/A?

Yes.

Regards,                                              Hewlett-Packard
Bob Niland      Internet: rjn@hpfcrjn.FC.HP.COM       3404 East Harmony Road
                UUCP: [hplabs|hpfcse]!hpfcrjn!rjn     Ft Collins CO 80525-9599

toddg@hpldola.HP.COM (Todd Goin) (09/11/90)

/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
>