On 12/18/2022 5:08 PM, Samuel Sieb wrote:
On 12/18/22 14:03, Bill Cunningham wrote:
On 12/18/2022 4:47 PM, Samuel Sieb wrote:
On 12/18/22 13:40, Bill Cunningham wrote:
IDK if you can do this or not. Say if you have a file that is 2.048
Gig and it is attached to a loopback device, say /dev/loop0,
losetup /dev/loop0 FILE_NAME,
And you tried cdrwtool -d /dev/loop0 -q;
Now I have tried this and get errors. IDK if there's a way around
this, a safety issue that is built in, or maybe I am not using the
right program to format a "dvd".
Can you dvdformat a loopback device?
No, that doesn't make any sense. The formatting is a physical
thing. For a disk image, you just make an .iso file. You can later
write that to a physical disk.
What are you trying to do?
I thought I would make the format, observe the detail then copy. For
example, I can format a loopback and observe the data with a hexdump
like xxd. This seems to work and thre is no physical device,
I use dd to create a 2.048 Gb zero'd file, for example.
losetup /dev/loop0 FILE to mount the loopback,
mkfs.vfat -F 32 /dev/loop0
and detach and xxd -g1 FILE.
There is a formatted FAT32 filesystem. Why can't this be done with a
DVD format UDF file?
Because the format doesn't work like that. It's designed for
sequential writing, you don't random access write to optical media.
(At least for CD and DVD.) The format command just writes the
initialization information to the optical media, it's data for the
drive, not part of the filesystem.
You use one of the iso tools to create UDF files, you don't need a
loopback for it.
OK I think I see, thanks for your insight.
B
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