Music Library on router USB drive

What Sonos speakers do you have?

1st room: 2 play 1 - Sub (Gen 2) - Beam (Gen 2)

2nd room: Play:5 (Gen 2)

3rd room: Symfonisk Shelf

4th room: Playbar

the fact is that I can see the network disk, connected with my computer and I can work on it, so it means the connection is working. Sonos App seems to loose often the path. Now I’ve just tried for the 5th time to re-connect the library and it’s working….very strange

The way Sonos works is one of your speakers is the ‘associated product’ and becomes the one responsible for adding music shares and re-indexing them. Certain speakers behave differently than others and won’t index from some NAS drives. Several of us on here have experienced this with the Era 300 for example. 

My guess is that you’ve rebooted some of your speakers as you had issues and eventually a different one became the associated product and the re-indexing worked again. If you use either the Windows or Mac Sonos apps, the about my system window shows which speaker is associated. If you have the will/time to only have one speaker turned on at a time you could possibly see which one has the problem by triggering a re-index with just that speaker active. At least then you could raise a case with Sonos for them to look at, unless you’re happy to just reboot the problem speaker if indexing fails. 

Good advice above. Sometimes things just get confused too. To avoid a support call to just be told to do a network refresh you can do one on your own.

Power down ALL Sonos.

Reboot router and controller, wait until fully ready.

Power up your Sonos.

I might try only powering up the Beam at first (newest one) and trying the process with just it active to simplify the situation. If it works power up the rest, if it fails then do the diagnostic and support call option.

Indeed i noticed the library now is visible and updated and the speaker associated is the beam; will check next time the network disc is no more visible what’s the associated speaker

 So I would like to understand indexing better than I do now.  My Associated Product is a Beam.  That’s one of five rooms.  When the library indexes is it indexing only to the Beam and the other speakers look to the Beam to see the library?

 I purchased a new 300 a month or so ago.  It refused to play my indexed library.  So I sent it back to Amazon.  So as Ian_S suggests if I had unplugged every room except the new 300 then the 300 would have become the Associated Product and I could attempt an index under those conditions.  Is that correct?

My understanding is that the indexing is done by a single device, then the result is copied to each (other) device. Which can take time, depending on several factors, not the least of which are file size and communication speed between each Sonos device. And possibly others, too. 

U know I’m going to disagree with a lot of learned people with the following statement:

I don’t believe that  the Music Library indexing is assigned to one specific speaker which as I read all your comments if that one speaker is disabled then the indexing fails. I could be wrong but I believe the indexing takes place at the source like a NAS and then that information is shared with all speakers except surrounds and subs. Furthermore I can’t find any documentation that a specific speaker is selected as the primary device.

Since the software (Sonos) isn’t installed on the NAS, I don’t understand how the list, which is all Sonos maintains, can be built there. But I’m no expert, either. Help me understand. 

Oh, no argument about documentation, though. I think it’s understood knowledge that leads to my post, not something I can point to. I’m certainly open to discussion ;)