Petr Baum wrote:

On Tue, 29 Oct 2019 04:11:18 AM Rohan McLeod wrote:

Hi Rohan, (and everybody...)

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I have got a big box of about 25 years old CD ROM disks with scanned B/W ... 3/ When I was investigating this issue I came to the conclusion that "M-Disk"s were the best current solution; this involves (a) buying an M-disk capable DVD R/W (most Blue-Ray drives) (b) a supply of M-Disks (25- 100)GB I purchased LG GP57EB DVD Burner which claims to be M-disc compatible.

Petr I am wondering if  there is some issue with  ability to write to M-Disks;  when Blu-ray is not explicitly  supported ? Compare the specs for your  LG GP57EB DVD Burner eg https://uk.rs-online.com/web/p/dvd-drives/8775522/  with a  LG BP50NB40 eg https://www.lg.com/us/burners-drives/lg-BP50NB40-external-blu-ray-dvd-drive this is also a USB 2.0 interface but it explicitly states Blu-Ray support . I mention this latter  device now, because I was surprised there were  Linux driver issues with Blu-Ray; so I bought one of these  at MSY for $149; tried it on a laptop which dual boots PureOs and Win7x64. but PureOS couldn't see it. The Linux driver issues seem to concern Blu-ray encryption and don't seem like they are going to be fixed anytime soon......so I didn't bother reporting the issue to the list ! If you are interested win7x64 is currently burning 18GB to a 25GB Verbatim BD-R SL 6x M-Disk;  in the LG BP50NB40 drive   via Burn-Aware; seems to be burning about 0.5GB/ min but this is over a LAN from this desktop

I also purchased 2 boxes Verbatim M-disc Bdr 25gb 5pk to use for trials. Both mail-orders arrived recently.

I tried the new burner with ordinary DVD using brasero SW. It created small data DVD without any issues. I created 21.2 GiB .iso with brasero also without any issues.

When I asked brasero to burn it and presented one M-disc in the burner it responded with "Please replace the disc with a supported CD or DVD". Search results for “M-disc” in brasero help returned: 'No matching help pages found in “Brasero Help”.

I also tried k3b with the same .iso. It asked for a disc, played a bit with inserted M-disc and then stopped, still asking for "an empty Blu-Ray medium"

So far no success but also no coaster...

Any advice what to try next would be appreciated.

 Sorry as mentioned above there seem to be encryption issues associated with developing  a Linux Blu-Ray driver; eg https://wiki.archlinux.org/index.php/Blu-ray although why this  must  prohibit  writing one's own Bu-Ray or M-Disk I have no idea ! regards Rohan McLeod