Problems with external USB 3 RAID drives unmounting

Hi, USB3 is prone to Bluetooth & Wifi interference, can you turn those off for a test?

I know your pain. I have the same issues with Mavericks. Apples implementation of USB 3 is a total disaster.

I am unable to use my enclosure at all. I am somwhat lucky. I have a firwire boar that allows me to remove the

usb 3 board and install firewire 800. Much slower thatn USB 3. But it is rock solid.

One more thing I would like to mention. Beware of using Time Machine on the usb 3 ports.

It has corrupted every drive I have tried. All my drives are 4 tb WD Black.

My Imac config, Late 2013, 32 gig ram, 4gig video card, 1tb flash drive.

I Have done every thing you have listed above and more with out any success.

I would love to find a solution.

Just a little more insight. I have a late 2012 rMBP bought it in Aug 13. Loaded 512 gig flash drive, 16 gig ram, Running Mavericks fully updated. It runs my 5 bay usb three external drive with out issues. It mounts, ejects copies, etc without any issues. It will run 24/7 for days with out any issues from the external drives. Important point the 5 bay enclosure is not raided. It is JBOD.

I have installed and reinstalled a clean install on my Late 2013 Imac and it still the same.

USB 3 on late 2013 imac is a disaster plain and simple.

Apple need to get this at least looked. Tim Cook is too busy playing politician.

HELP

Yes fails every single time.

I wrote some info when I first got my Imac. Apple support called me and wanted a capture off my machine.

but I never heard back from them on what the problem was.

It is a mess.

I hace the same problem with USB3, External storage support ask for update the drivers, and apple suport saisd are the last version and let me send the iMac 27" for HW repair but not seams the way. I'll change the cable to use slow USB 2.0.

I'm having the same probleme with external raid on USB3. Periodically, just gets detached.

Posted on another thread:

I have completely given up on USB3 hubs. They are very unreliable, even with cables shorter than 2 ft.

I only directly connect USB3 devices (drives) directly to my 2012 iMac now, with short good-quality USB3 cables.

Note: I got several cables from Amazon, all same length 0.5m, and tested them. There was a 20% difference in disk data speed between slowest and fastest. I kept the fast one and sent the others back.

I was also told that my wireless 2.4 GHz mouse (not bluetooth) would interfere with the hubs. It did.

If you ask me, USB3 is a crappy but fast hack.

Problem solved:

I bought my iMac a a week ago, updated to mavericks rite away, then hooked my external 4 bay drive, started to transfer large files, my drive disconnected and connected rite back every time. I did every thing possible to fix this issue but no luck, called apple as usual told me to take it to apple store, but I thought before I take it in ill try to install older version of OS.

I Downloaded mountain lion, loaded to usb stick, formatted the drive and fresh installed to OS 10.5 and problem was solved, now that the disconnecting problem is solved, I noticed that the transfer rates has been slowed down a bit, and black magic is also showing me about 20Mbs slower then it was on mavericks ????? Humm

I think mavericks is throwing more power to the USB 3 ports then it should, more power means faster transfer rates therefor disconnecting the drives. IDK I'm no expert but bottom line is the issue has been solved and it's disappointing how apple is pushing them selves in the gutter with windows OS, the whole point of switching to mac was to use something stable and not to waste our times with fixing the issues, I have wasted an entire week on this and the best part is, I bought a maxed out iMac/ top of the line.

Any ways hope this helps you guys and apple should be a shamed of them selves and free OS doesn't mean you start making crap