On Thu, Jul 25, 2019 at 10:19:11AM +0800, Zhi-Qiang Lei wrote: > Hi, I’m trying to encrypt a DVD-RAM before putting some files onto it on my > OpenBSD 6.5 desktop. But neither dd nor disklabel seems able to work on the > drive. Did I miss something? > > $ dmesg | grep cd > cd0 at scsibus3 targ 1 lun 0: <HL-DT-ST, BD-RE BU40N, FR07> ATAPI 5/cdrom > removable serial.13fd3940302020202020 > cd0 at scsibus3 targ 1 lun 0: <HL-DT-ST, BD-RE BU40N, FR07> ATAPI 5/cdrom > removable serial.13fd3940302020202020 > > $ doas dd if=/dev/urandom of=/dev/rcd0c bs=1k > > > dd: /dev/rcd0c: Invalid argument > 1+0 records in > 0+0 records out > 0 bytes transferred in 0.000 secs (0 bytes/sec) > > $ doas disklabel -E cd0 > cd0> a > partition: [a] > offset: [0] > size: [2236704] > FS type: [4.2BSD] > cd0> w > cd0> p > OpenBSD area: 0-2236704; size: 2236704; free: 0 > # size offset fstype [fsize bsize cpg] > a: 2236704 0 4.2BSD 2048 16384 1 > c: 2236704 0 unused > cd0> q > No label changes. > > The same drive can be formatted and used on Mac OS X.
Try growisofs from sysutils/dvd+rw-tools in ports.
