On Mon, Nov 24, 2025 at 9:49 PM home user via users < [email protected]> wrote:
> On 11/21/25 10:13 AM, home user via users 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. > [...] I tried ddrescue on the April back-up. It took several tries, > but it finally worked... > > - - - - - - - - - - - - - - - > > root:~# ddrescue -f -n /dev/sr0 bluray.img ddrescue1124.log > GNU ddrescue 1.28 > Press Ctrl-C to interrupt > ipos: 24756 MB, non-trimmed: 0 B, current rate: 48562 kB/s > opos: 24756 MB, non-scraped: 0 B, average rate: 34967 kB/s > non-tried: 0 B, bad-sector: 0 B, error rate: 0 B/s > rescued: 24756 MB, bad areas: 0, run time: 11m 48s > pct rescued: 100.00%, read errors: 0, remaining time: n/a > time since last successful read: 0s > Copying non-tried blocks... Pass 1 (forwards) > Finished > root:~# cat ddrescue1124.log > # Mapfile. Created by GNU ddrescue version 1.28 > # Command line: ddrescue -f -n /dev/sr0 bluray.img ddrescue1124.log > # Start time: 2025-11-24 15:03:13 > # Current time: 2025-11-24 15:15:01 > # Finished > # current_pos current_status current_pass > 0x5C39F0000 + 1 > # pos size status > 0x00000000 0x5C3A00000 + > root:~# > [snip] > root:~# ls -l bluray.img > -rw-r--r--. 1 root root 24756879360 Nov 24 15:15 bluray.img > root:~# > > - - - - - - - - - - - - - - - > > The non-zero data starts at hexadecimal address 8000 and ends at > hexadecimal address 191A43E4B. So about 6.7 GB of actual data was > recovered. The underside of the disc showed that the inner 1.15 - 2 cm > (approximately) had been written by the April back-up. > > In early June, I had to get off-line help to complete recovery of a > back-up from a bad USB stick. I don't know how he did it, but I gather > it was quick and easy. When it was done, he made a compressed ISO file > available to me to download. > > The IMG file produced by the ddrescue is on the old desktop (F-42 > Workstation). Using a hex editor, I'm able to recognize directory > names, file names, and strings from text files in the IMG file. How do > I finish this recovery? Again, I'm not an IT professional. I need > complete step-by-step instructions. While I await that, I'll be trying > (again!) to get yahoo e-mail working in Thunderbird. See: <https://linuxvox.com/blog/linux-mount-an-iso/>. Note that some software expects a .iso extension, but the contents should be the same whether you use .iso or .img extension with dd. -- George N. White III
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