Q: iMovie 10.0 and Network Drives

Me too - using Synology NAS (not Apple formatted Extended Journaled File system).  Worked before in iMovie just before upgrade, apparantly this is no longer an option? 

What if the external drive and all our media is much larger than the Apple Hard Drives provides for?  The new iMovie 10 library format appears to be limiting in requiring a certain disk format.  I understand the pros and cons, however, would be willing to accept the limitation and cons over no avail whatsever.

As the original poster stated, I also have the same problem.  Used to be able to see my iMovie library on my Synology NAS and now I am unable to see it.  Same error when I try to create a new library on the NAS.  I am hoping Apple recognizeds the issue and pushes out a fix ASAP. 

I too am faced with the same problem, just updated to latest iMovie but cannot see my events and it states i cannot save to the Asustor NAS drive I always used to. Although I can play the files through explorer argh!

I am running into issues with the new iMovie. It used to point cleanly to an external drive and now it isn't. Can someone pls help? Thx.

RE: external drive issue, could be same one I am seeing:

https://discussions.apple.com/thread/5471461?tstart=0

I have the same problem with my ReadyNAS. This must be fixd, I can´t store 1,5TB video on my laptop!

Same problem here, my rMBP only have 256GB flash storage. NAS support shall be a default function for any new version iMovie.

I had the same problem and 'solved' it by creating a spares disk image on the network drive. Works for now but I have to remember to activate it before starting up iMovie.

iMovie is asking for a disk that is correctly formated. You're not able to format your NAS in the correct way so you need to create a disk image that is in the correct format. That image can be created on the NAS

disk utility - new image

Save as: your-name

Where: Network share

Name: your-name

Size: Custom

Format: Mac OS Extended (Journaled)

Encryption: none

Partitions: Single partition - Apple partition map

Image Format: sparse disk image

(google can help)

Your disk image will mount as a fully functional disk which can be used for iMovie to store your library

(can someone explain the differance between sparse bundle disk image and sparse disk image?)

I can confirm that MacSjon1's solution works!  I had been troubleshooting this for days, and this sparse image idea is a stroke of brilliance. iMovie treats the mounted volume as an external drive as opposed to a NAS.

I'd like to add that when creating the CUSTOM size, select an amount that allows for library growth.  I have about 250GB of video, and I chose 500GB. It doesn't take that much space, but it gives me an image with growth potential.

Transfer the Movies and Events folders to the mounted image. If the image is unmounted when iMovie is launched, double click the image, and iMovie will ask to update those projects/events. Otherwise, just click "Update Projects" etc etc.

From this point forward, your iMovie Library lives on the disk image (which lives on your NAS).

Again, brilliant solution, and I give huge props to MacSjon1.

MacSjon1,

Ditto.  Thank you for you the workaound! 

Since my library is approx 1/2 TB, I wanted to ask a potentially newbie questions to see if you or someone can please help me (and others?) measure twice and cut once. 

For those like myself who have not played much with creating new Image Files under Disk Utility, should I go ahead and create a larger 1 TB Image now, or can I expand the image size later if I find I need to bump up image disk space over time (assuming Apple doesn't release a patch re-activating NAS file system access)?  

The reason I'm asking (basically, the question behind the question) is whether a really large image file will be any kind of performance issue sitting on a NAS vs. a smaller image file.  I assume this is mostly memory based application fileswapping, etc.  I should add, I have googled the Sparse Image format, so I understand the concept now of it not using the full file size until it needs it, but if my currect library is 1/2 TB, shouldn't I need a full TB because it will convert my existing library into the new format causing it to store the library in the new .library format, thereby taking up the remaining 1/2 TB?

Thank you very much in advance for any guidance and response.

This was a revelation, thank you!

Can I do the same thing for my iTunes library on my NAS? My library is already stored on my NAS, but it takes forever to load, edit metadata, move files, etc. I would like to transfer it to a mounted drive for sure!

Thanks in advance for your help.