unexpected network error

[webmdb531]

There's a first time or everything and this one message I've never encountered before.

My setup is as follows: main PC is Win10 pro, network server is Ubuntu 20 with a bunch of attached PCs, android phones and tablets, and a Unifi network. 

In the process of simultaneously backing up two separate home network folders onto BD-R DLs using two LG WH16NS40 drives this message popped up during verification. At the same time. I figured the network dropped off somehow and sure enough, Windows Explorer had lost connection. I use Webmin for server management and reconnected immediately but ImbGurn failed to resume verification after repeatedly clicking the Retry button. Explorer also reconnected.

Strangely no log for the session in question for the entire day. The most recent log was from 2025-11-22, last Saturday.

I will verify the backups against ISOs but my main question is why didn't ImgBurn resume verification? If the network did indeed drop - and I'm not sure it actually did drop - shouldn't ImgBurn rseume the job? Or am I missing something?

BD-R DLs are sensitive things. I use them quite a bit and a loss of 10% is not unusual but a bad disc will usually show up during the write portion. If it's during the verify it'll be a obvious read error. This error wasn't the data or the disc, it was about a broken transfer from data to disc. The LS40s don't have a great reputation but mine have lasted 5+ years under production level use, reading/writing several times per day.

I'd appreciate some advice on this, especially on a method of checking ImgBurn's connection to the network without interrupting the job at hand. Verifying against an ISO is OK but it's after the fact. It would also be great to verify a disc against files, not just an ISO.

Edited 1 hour ago by webmdb531