On Fri, Nov 21, 2025 at 1:13 PM home user via users < [email protected]> wrote:
> (F-42 Workstation; gnome) > > This past spring, I backed-up some 15-20 GB to an MDISC blu-ray. Now I > need to recover that data. > > The optical device is blu-ray. It (supposedly) handles MDISC. It > connects to the desktop via 2 USB ports. > Normally, one USB port is for data and the other for power. I have a DVD drive with one USB data cable and a power cable with USB plug on one end and a round plug on the drive end, so it is obviously the power cable, Some systems (notably, Apple) enforce strict USB power limits so require a 5v power adapter in place of the USB power cable. I have also used powered USB hubs with just the power connection. I think linux has moved to more strict enforcement of USB power limits, so may now require an external source of power. If power is the problem, there should be entries in the journal. With the optical drive data cable disconnected, try starting `journalctl --follow` in a terminal, then connect the data cable and watch for useful messages in the journal. > - I tried recovering the data logged in as a regular user, as the admin, > and as root. > - I tried the file browser, Brasero, Gnome CD Master, and K3b. They > either don't see the device, or they see it but don't know there's a > disc in it. Gnome CD Master shows the device's status as "Busy". > - I tried plugging in the device after logging in; I tried plugging it > in before powering up the desktop. > Nothing works. > The "Disks" utility does see the optical drive. > I get no real error messages. > > I spent time in the "mount" man page, but could not make sense of it. > > I've spent hours on this. How do I recover the back-ups from the > blu-ray disc? At work we had many portable optical drives but the failure rate was high. Try contacting a local linux users group an ask if someone has a working blu-ray drive and would be willing to copy your data to a flash drive. Last resourt would be a commercial service. -- George N. White III
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