External Drives Not Recognized After Upgrade

I do have the exact same problem - and it's even worse because I don't have a backup to switch back to Yosemite (even if I would have done a backup on the Lacie hard drives I would have hat this problem!). Had no chance to contact Lacie Support (awful website) and really wonder, that this problem is not known and foreseen there. This is an actual raid and should be tested already. All have 2 20TB 5Big Thunderbolt2 LaCie devices wit a lot of data and am not possible to access them. Never experienced such a mess.

Good, if you have contact to them (or can get in contact with them). I think this should not happen as a company like Lacie should test their (actual) products with the beta which was already available since several weeks/months. I also hope there will be an update of the driver/software soon. Thank you for your efforts!

Exact same problem here. LaCie 5Big Thunderbolt2 (20TB) no longer shows up in finder after upgrading to El Capitan. Neither when connected to iMac (updated with drive connected) nor Mac Book Pro (updated without drive connected). I'm shocked as this issue was nowhere mentioned and both iTunes and Aperture libraries are on the LaCie drive.

Same Problem with a 2big LaCie 6TB with my clients 1/2 of my clients football season video on it. Can't open the FCPX libraries on it. Can't copy libraries to internal IMac drive. Can only copy original media files to a second promise 4TB external drive. Translation - about 20 hours of video that was cataloged needs to be re-cataloged and a few key projects missing that will need recreation = PIMA! For the love of Ron Burgundy LaCie, issue a patch!!!!!! Apple care very helpful but wrote it off to a bad drive. I was believing this until I saw this forum. Please post updates on the (hopefully soon) solution.

Actually I did a new search on this topic and found this article on a Lacie knowledge form. They say - that the Raid Manager IS compatible with El Capitan (no direct Link to the software in the mentioned article speaks for itself). So I visited the Lacie Webpage and downloaded the 'newest' Software under the Lacie 5Big Support Page - which is the version 'LaCie RAID Manager_4.1.0.2060' (I already have the version 'LaCie RAID Manager_4.1.0.2061' downloaded several days ago after upgrading to El Capitan (OS X 10.11)). So I thought - maybe an earlier Version of the Raid Manager will do the trick, downloaded it and tried it to install it on my System (iMac Retina 5K, 27-inch, Late 2014). With no success. El Capitan tells me, that the package I try to install is not compatible with El Capitan (Screenshot in german is below).

I have no glue what they are testing at Lacie. As I have no possibility to get in contact with them here in my country (AT - have tried it on several ways) - can someone please tell them? (Or hopefully someone at Lacie is reading this topic anytime soon.) Even worse: they are still selling this Product on their webpage and claiming, the device is working with OS X System 10.9 and above (!!!).

I also grabbed the most recent driver from the LaCie site. Not sure if it helped as I still cannot open FCPX libraries on that drive. I can however seem to copy FCPX library events (open package contents on your library to access these) and copy to another library on another drive. I was able to grab original media this way prior. I was able to do this prior as well but the files would not show up in the new FCPX library once FCPX was open. Today they are showing up. Not sure what the difference is - the new driver? If I can get the rest over I won't have to re-keyword/categorize all my video.

At the end of the day - B & H Photo shipping me a new Pegasus Raid 5 8 TB drive (6 TB useable with this Raid config, but hard to lose data with a single drive failure of the four contained). I have a 4TB version of this drive and it's been solid for 5 years (knock on wood) . I've gone through a WD (lasted a couple months) and now this Lacie (lasted 2 years). Spend the money for the Pegasus - solid, fast, dependable, and with raid 5 configured - no data loss. $1050 at B & H, & it'll be here tomorrow.

Note to LaCie - web site navigation and dead/broken links need your attention. No troubleshooting tab in support as directed to by site pages. I'll try forwarding a link to this page to Lacie for you Roman.

Good luck, I learned my lesson the hard way here.

I'm another unhappy Lacie customer, with the same problem.

I did a clean install of El Capitan on my 13" MBP - Lacie 5Big (20GB) isn't showing up at all!

I did a upgrade install from Yosemite to El Capitan on my 15" MPB -Lacie 5Big (20GB) isn't showing up at all!

It is clearly a problem with Lacie's current driver, looking at the similar posts here, that seems the logical reason.

Lacie's customer service has become very poor here in Australia in the last 12 months, as I suspect it has in other countries since they changed ownership, I haven't received a reply to my raising this issue with them 6 days ago.

So my friends, it seems all we can do is harass Lacie to fix the problem.

my LaCIe rack mount R8 external thunderbolt 2 keeps disconnecting after i installed the final version of 10.11....connects again and disconnects...keeps doing this....i talked to LaCie and they said that they are releasing a new Raid Manager soon....should be out any day....

funny thing is: i ran all 10.11 betas from the beginning.....no issues at all.....the final version created the issue!

I have an older Lacie Porsche Design desktop drive and since updating to El Capitan Time Machine is unable to back up to "Lacie"...that's the message in the Time Machine window.

I also downloaded the most recent Lacie Desktop Manager and another download and nothing has helped.

I need this back up for obvious reasons, and like others here, hope it happens very soon!

Any help and/or advice is greatly appreciated, and thanks in advance to anyone who responds.

Running ElCapitan i have the same problem with our 27 inch 5K iMac when connected to my LaCie 6TB Raid via Thunderbolt . however , connected to my late 2013 15inch Retina MacBook Pro, which i have been running taking part in the MacOSX Beta program , the drive is working well . could it be different processors causing the problem?

are you still running a beta on the retina mbp? i never had any issues while running any of the betas, only having issues since updating to the final release...

My two Lacie raid drives seem to be saving files and mounting. One was attached during the upgrade to El Capitan and the other was not. Found that I could not rename nor format the LaCie Little Big which is in Raid 1 mode. Rebooted to Yosemite and all is working as expected in Disk Utility.

Found this article on LaCie's site:

http://knowledge.lacie.com/pkb_ArticleView?id=kA030000000iKoI

Seems Disk Utility no longer supports Raid Drives !!!!???? The article gives instruction on how to use the Terminal to manage the raid drives. Good Grief!!

My MBP 15in retina with 2.6 GHz Intel Core i7 and 512 GB flash memory is now on 10.11 as i quit Beta as soon as ElCapitan became available ; the iMac with Intel Core i5 and a 1TB fusion drive is now also on ElCapitan but was never on the Beta programme . i thought i had better check on the latest before posting this reply , switched on the iMac and connected the LaCie . low and behold the drive is suddenly showing in the Finder and has just finished backing up though i had done nothing further to deal with the problem .....

Disk Utility is showing the drive including ' RAID set volume ' though i don't use RAID as we have a Time Capsule as a secondary backup

confused ? i am

just downloaded the new raid manager and FW update, all seems fine now....