Using a USB disc writer (which is capable of writing to DVD-RAM) I can only write about 1G to it.
The same USB disc writer on another computer and OS (archlinux) can write it completely.
So I think this problem is a parrot OS problem, not device or disc problem.
On parrot OS: (used sudo to eliminate any unknown permission problems)
$sudo dd if=/dev/zero of=/dev/sr0 bs=2M iflag=nocache oflag=direct status=progress
1071644672 bytes (1.1 GB, 1022 MiB) copied, 543 s, 2.0 MB/s
dd: error writing '/dev/sr0': Invalid argument
512+0 records in
511+0 records out
1071644672 bytes (1.1 GB, 1022 MiB) copied, 542.717 s, 2.0 MB/s
On archlinux: (completely different computer)
$ sudo dd if=/dev/zero of=/dev/sr1 bs=2M iflag=nocache oflag=direct status=progress
4580179968 bytes (4.6 GB, 4.3 GiB) copied, 2319 s, 2.0 MB/s
dd: error writing '/dev/sr1': No space left on device
2185+0 records in
2184+0 records out
4580769792 bytes (4.6 GB, 4.3 GiB) copied, 2319.23 s, 2.0 MB/s
Can anyone confirm that? (Maybe on DVD+RW? I have none of those.)
I have no idea what the problem is.
Since dd is straight forward, I guess it has to do with dvd+rw-tools or anything dvd/scsi/usb related.
Other information:
Installed dvd+rw-tools (current version):
dvd+rw-tools/stable,now 7.1-12 amd64 [installed,automatic]
Though, system is not up2date, the updates are negligible I think?
(I will update und tomorrow, after the next reboot, I will know it for sure.)
$sudo apt list --upgradable
Listing... Done
firejail/stable 0.9.54-1parrot6 amd64 [upgradable from: 0.9.54-1parrot5.1]
linux-compiler-gcc-7-x86/stable 4.17.8-1parrot8 amd64 [upgradable from: 4.16.16-2parrot16]
linux-headers-amd64/stable 4.17+98+parrot1 amd64 [upgradable from: 4.16+97+parrot1]
linux-image-amd64/stable 4.17+98+parrot1 amd64 [upgradable from: 4.16+97+parrot1]
Parrot version: Release 4.2 64-bit
$uname -r -> 4.16.0-parrot16-amd64
dmesg and journalctl -e don’t show anything when/after 1G with dd is reached.