I have written a data disc with 2.4GB files on it (with K3B).
Now, I can´t read the burned disc under Linux.
With Windows 10 x64 22H2, this works.
good - no problem then 
There are tools (for Linux) that try to read multiple times and recover well and keep trying in case of read errors.
Don’t recall the names - ddrescue might be one.
There are a few.
I’m glad the era of optical discs is almost gone.
All the disks that I have written - especially to RW media - are no good anymore after only a couple of years.
Degraded too much.
I guess you got lucky with Windows being able to still read it.
(assuming it is an “old” disc - which it might not be)
I’ve had nothing but problems with self written optical media, especially after some time.
What’s “I can’t read”?
No disk, the disk can be mounted but there’s no data inside, the disk appears but error reading data…? Be more accurate, please.
I still have my loved (Original) Record of Lodoss War (Japan Language +Subs) DVD’s collection.
Optical (Physical) Disc’s that i really own… i even evade Steam and other Launcher as long as i could, because of this license stuff.
At the end of the disc (end of written data), some files can´t be read.
It is a new written disc with 2.4 GB data on it.
An USB stick is not the suitable media, since I must send the data with mail.
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I typically choose UDF as the format for data disks; this format is generally readable by most operating systems, and tends to be more resilient than Joliet, for example.
Which format did you use in Windows?
Does the recipient have a Windows machine available?
After i connected the first time my digital cam under (Linux) Manjaro/KDE i had problems to open the device with Dolphin.
But when i open a filebrowser, for example with the help from Firefox context menue (File>Open File), it was possible to get access to the storage.
Firefox was just one example btw, there must be other program’s too.
I don´t know, if there is a Windows machine.
I have used some new media and now it works.
Discs can be damaged in the mail. Another solution is put the data on a file sharing service. I’m assuming your friend has a decent internet connection. Honestly a 4 gig flash drive is pretty cheap and can be mailed as well. Just in case your friends doesn’t have a dvd drive.
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And as a bonus, you have a new set of drink coasters…
Everybody wins.
I can´t upload these data to the cloud.
You could put all the data into an encrypted archive and then upload that.
You’d need a secure way to share the key, but otherwise this would be much more secure than mailing a CD or a usb drive with all the data unencrypted on it.
I have travelled to the receiver of the data to Munich.
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