Hi
The FIRST thing to do when things do not seem to appear is to run a "Scan Disk" this normally sorts things out.
However there are also some good practice "things" to remember when placing music on the B2's disk
1) while doing this do not ask the B2 to do anything else at the same time (eg listen to music etc.)
2) if you have asked the B2 to do something let this finish before you start the next piece of work.
3) check the length of file names ( I believe there is a 172 character limit)
4) Assuming you are asking the B2 to compress, allow it to do this - and complete the compression - after about every 20 to 30 CDs before loading the next set.
5) after about each 60 CD loads, do an "Export to USB C (or A)" which will make you an incremental backup of your work (allow compression to finish first).
6) Run a scan disk after every CD batch load.
Understand that the Brennan UI (web or front screen) when displaying music, is NOT looking directly at the Hard Disk to tell you what it holds. Rather it uses a contents database (generated by the Scan Disk) for this information. This database and indeed playlists are all text files containing pointers to the actual music on the Hard disk.
Fred