Created attachment 221674 [details] VirtualBox behaves as if it can not read from the device dd(1) and gdd(1) can read from the device, for example: % date ; uname -v Sun 17 Jan 2021 13:28:38 GMT FreeBSD 13.0-CURRENT #75 main-c572-g82397d791: Sun Jan 3 20:00:09 GMT 2021 root@mowa219-gjp4-8570p:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG % gdd status=progress bs=24M if=/dev/cd0 of=/tmp/foo.iso 100663296 bytes (101 MB, 96 MiB) copied, 30 s, 3.4 MB/s^C 5+0 records in 4+0 records out 100663296 bytes (101 MB, 96 MiB) copied, 35.0774 s, 2.9 MB/s % ---- % ls -dhl /dev/cd0 crw-rw-rw- 1 root operator 0x8e 17 Jan 08:51 /dev/cd0 % pw groupshow operator operator:*:5:root,grahamperrin,bbsadmin-l % whoami grahamperrin % ps aux | grep -i virtualbox grahamperrin 6049 0.0 1.2 381936 193844 - S 09:06 0:57.96 /usr/local/lib/virtualbox/VirtualBox grahamperrin 6078 0.0 0.1 28936 15432 - S 09:06 0:09.42 /usr/local/lib/virtualbox/VBoxXPCOMIPCD grahamperrin 6080 0.0 0.7 206152 119600 - S 09:06 0:26.99 /usr/local/lib/virtualbox/VBoxSVC --auto-shutdown grahamperrin 12196 0.0 0.3 85504 45972 - I 10:21 0:00.03 /usr/local/lib/libexec/kf5/kioslave5 /usr/local/lib/qt5/plugins/kf5/kio/file.so file local:/var/run/user/1002/VirtualBoxMOtLyZ.2.slave-so grahamperrin 13448 0.0 0.0 13052 2792 2 S+ 10:36 0:00.00 grep -i virtualbox % ---- Log out not required; I have been using VirtualBox on this computer for around two years.