-I bought a Samsung USB drive when m-disks were new and got some media to backup my Windows laptop. I was using Acronis and the boot and restore from USB was a pain; so I have left over unused disks I should use. The disks I did create are still readable on Linux. FWIW, here's output from xorriso -to from two mdisks. One is a Verbatim and the other is Millentia; one was written. These reports are from an LG SATA BD drive.
Drive current: -dev '/dev/sr0' Drive access : exclusive:unrestricted Drive type : vendor 'HL-DT-ST' product 'BD-RE WH16NS40' revision '1.02' Drive id : 'K9AE5EA4251 ' Media current: BD-R sequential recording Media product: MILLEN/MR1/0 , Millenniata Inc. Media status : is blank Media blocks : 0 readable , 12219392 writable , 12219392 overall Media summary: 0 sessions, 0 data blocks, 0 data, 23.3g free Drive current: -dev '/dev/sr0' Drive access : exclusive:unrestricted Drive type : vendor 'HL-DT-ST' product 'BD-RE WH16NS40' revision '1.02' Drive id : 'K9AE5EA4251 ' Media current: BD-R sequential recording, Pseudo Overwrite formatted Media product: VERBAT/IMk/0 , Mitsubishi Kagaku Media Co. Media status : is unsuitable , is POW formatted Media blocks : 35185280 readable , 12906880 unused , 48092160 overall Media summary: unsuitable Pseudo Overwrite formatted BD-R I will try to burn an m-disk next with xorriso and let you know how it goes. Paul On Tue, Jun 28, 2022 at 6:50 AM Thomas Schmitt <scdbac...@gmx.net> wrote: > Hi, > > Paul von Behren wrote: > > Can xorriso burn/engrave an M-Disc? Can any other Linux SW? > > Yes to both, although rarely tested. > In my mailbox i find libburn user reports only for BD-R M-Discs. > > M-Disc is entirely a matter of drive and medium. The burn programs get > the media info from the drive which presents M-Disc as DVD+R or BD-R. > (Verbatim seems to sell M-Disc DVD as "DVD R" omitting the significant > difference between DVD-R and DVD+R. But i remember that DVD+R was > mentioned when the M-Disc technology was announced.) > > So if you really want to pay the price difference between M-Disc and > other write-once media, then give it a try with your favorite burn > program for DVD or BD. > I would of course be glad if you choose xorriso or cdrskin. > > Please report the outcome. > As said: Reports are rare. > > ---------------------------------------------------------------------- > > If the burn run looks successful, consider to run > > xorriso -for_backup -indev /dev/sr0 -check_media -- > > to get an impression of readability. > > If you use xorriso to create an ISO 9660 filesystem, then consider to > use -for_backup to equip the data files and the overall filesystem with > MD5 checksums. (With xorriso's mkisofs emulation the option begins by > two dashes: --for_backup.) > > A xorriso run with -for_backup ... -check_media will then verify the > overall checksums. > But even without recorded MD5s it will check the readability of all data > blocks of the written area. > > > If you recorded MD5 and want to check the single file checksums: > > xorriso -for_backup -indev /dev/sr0 -check_md5_r sorry / -- > > This will report on stdout each file which fails to match its recorded > MD5. Informational messages and pacifiers appear on stderr. > The exit status of xorriso will indicate whether all was fine (0) or > whether files failed the test (not 0, actually 32). > This check works only if indeed MD5s were recorded by xorriso. > > Consider to repeat this checking regularly to get an impression how your > recorded files are doing. > > > Have a nice day :) > > Thomas > >
