On 7/24/19 10:19 PM, 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. Thanks and best regards, Siegfried
Did you try 2K blocks? The low level of CDROM only works that way.
