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MO drive - disklabel vs. "raw" FS ?



Hello all,

Nothing is wrong here and I have this working fine.  Just curious as to the behavior and what's happening in lower layers for this.

I have a SONY SMO-F561 MO drive I hooked up to some of my sparc's.  I am using RW disks too (not WORM).  I first tried to lay down a disk label and it errors out upon trying to write the label (bad magic number or something...)

So pressing on I used "newfs -I /dev/sd1c" to make the FS with no 4.2BSD disklabel.  Worked fine, I am able to read/write/verify files on the disks.

I was just wondering - is there something about MO disks in general - or something that this drive tells the host via SCSI message that bubbles up to disklabel to cause this ?

I have a Jaz drive too and I'm pretty sure I was able to disklabel that.  Obviously Jaz disks are really just HDD platters (pure magnetic) whereas MO is + optical.

Thanks.


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