Sorry, I forgot to mention:

It's NetBSD 3.0 on i386 and I am able to dd /dev/rsd0d without cgd.

***********************************************
petar@starling
$ sudo dd if=/dev/zero of=/dev/rsd0d bs=64k
^C143+0 records in
142+0 records out
9306112 bytes transferred in 9.042 secs (1029209 bytes/sec)
***********************************************

(The transfer-rate is ok -> USB 1.0)


Petar Bogdanovic wrote:
> 'ello!
> 
> I just wanted to 'scrubb' my new external USB-Harddisk..
> 
> ********************************************
> umass0 at uhub0 port 1 configuration 1 interface 0
> umass0: Western Digital External HDD, rev 2.00/6.02, addr 2
> umass0: using SCSI over Bulk-Only
> scsibus0 at umass0: 2 targets, 1 lun per target
> sd0 at scsibus0 target 0 lun 0: <WD, 1600BB External, 0602> disk fixed
> sd0: fabricating a geometry
> sd0: 149 GB, 152627 cyl, 64 head, 32 sec, 512 bytes/sect x 312581808 
> sectors
> ********************************************
> 
> 
> ..with..
> 
> ********************************************
> cgdconfig -s cgd1 /dev/sd0a blowfish-cbc 128 </dev/urandom
> dd if=/dev/zero of=/dev/rcgd1d bs=64k
> ********************************************
> 
> 
> ..but unfortunately, I get this:
> 
> ********************************************
> petar@starling
> $ sudo dd if=/dev/zero of=/dev/rcgd1d bs=64k
> dd: /dev/rcgd1d: Read-only file system
> 1+0 records in
> 0+0 records out
> 0 bytes transferred in 0.003 secs (0 bytes/sec)
> ********************************************
> petar@starling
> $ dmesg | tail
> (...)
> cgd1: error 30
> ********************************************
> 
> 
> A quick Google on mail-index didn't help and I really don't have a clue, 
> what I'm doing wrong..
> 
> 
> Thank you very much & with kind regards,
> 
> Petar