Unix disk images and archiving - test-drb@ccmp.vtda.org

26 Mar 2002

...
  Date: Tue, 26 Mar 2002 05:12:50 -0500
 To: classiccmp(a)classiccmp.org
 From: Jeff Hellige &lt;jhellige(a)earthlink.net&gt;
 Subject: Re: Unix disk images and archiving
 Sender: owner-classiccmp(a)classiccmp.org
 Reply-To: classiccmp(a)classiccmp.org

 I think you will have to write a disktab entry for
the MO drive.  I had
to add one for the Jaz.  NS3.3 is pretty good at determining disk
geometry if the drive supports the sense command.  Since PM bit the
dust, I'm not sure if there is much documentation out there about the MO
drive.  Also keep in mind that the NeXT cube SCSI implementation is
pretty primitive. 
 	Thanks James...I'll try the disktab from your other message.

 One question, does the MO drive show up in the
Workspace browser when
you insert a disk?  I can't format a Jaz cart from the command prompt
with disk, but I can by selecting it in the GUi and then selecting Disk
Initialize....I don't know why. 
 	Yes, the DOS and Mac formatted disks mount automatically when 
 the disks are inserted and on one it doesn't recognize it asks if I 
 want to initialize.  It fails initialization from the Workspace just 
 as it did from the shell.  I wasn't sure if NS supported 
 512bytes/sector or not on the MO.

 	I'll let you know how the disktab works. 
For what it's worth, I have used 3.5" MO disks on my NeXTs for many
years.  They have 512 bytes/sector.  I did have to write a disktab entry,
although the values in the table do not at all resemble the true
disk geometry.  (1 head, 25 sectors, 10000 tracks approx.)  Just
keep the product of heads * sectors * tracks less than the actual
number of sectors on the disk.

    carl
-- 
        carl lowenstein   marine physical lab   u.c. san diego
                                          clowenstein(a)ucsd.edu