"cg 0: bad magic number" with umass

[Marius Strobl]

On Fri, Jun 26, 2009 at 06:41:40AM +0300, Ari Sovijrvi wrote:
> Hi folks!
> 
> I added a 1 terabyte USB harddisk to my Fire V100 for backups. I have 
> recently used the same device with Linux and with i386 FreeBSD. I zeroed 
> the disk and labeled it with sunlabel. However, newfs always dies with the 
> error "cg 0: bad magic number". I also tried to label it into several 
> smaller chunks, no luck.
> 
> I also tried to newfs the whole device without a disklabel, but that also 
> ends with the same error.
> 
> Here's an example of the outcome, with 1 gigabyte partition:
> # newfs /dev/da0b
> /dev/da0b: 1027.6MB (2104512 sectors) block size 16384, fragment size 2048
>         using 6 cylinder groups of 183.72MB, 11758 blks, 23552 inodes.
> super-block backups (for fsck -b #) at:
>  160, 376416, 752672, 1128928, 1505184, 1881440
> cg 0: bad magic number
> 
> Here's bits of the dmesg, showing the drive:
> umass0: <LaCie SA LaCie Hard Drive USB, class 0/0, rev 2.00/0.00, addr 2> 
> on uhub0
> da0 at umass-sim0 bus 0 target 0 lun 0
> da0: <ST310005 28AS > Fixed Direct Access SCSI-2 device
> da0: 1.000MB/s transfers
> da0: 953869MB (1953525168 512 byte sectors: 255H 63S/T 121601C)
> 
> Any ideas of what's wrong?
> 

If this is with FreeBSD 8 you should contact Hans Petter Selasky.

Marius