Q: Anyone else having problems with external disks unmounting randomly/suddenly on Mavericks?

I tried the unchecking "put hardrives to sleep" but that did not help.  Here is what Etrecheck shows:

Hardware Information:

          iMac (27-inch, Late 2009)

          iMac - model: iMac10,1

          1 3.06 GHz Intel Core 2 Duo CPU: 2 cores

          16 GB RAM

Video Information:

          ATI Radeon HD 4670 - VRAM: 256 MB

Audio Plug-ins:

          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9

          AirPlay: Version: 1.9 - SDK 10.9

          AppleAVBAudio: Version: 2.0.0 - SDK 10.9

          iSightAudio: Version: 7.7.3 - SDK 10.9

Startup Items:

          DigidesignLoader: Path: /Library/StartupItems/DigidesignLoader

          PACESupport: Path: /Library/StartupItems/PACESupport

          tap: Path: /Library/StartupItems/tap

          tun: Path: /Library/StartupItems/tun

System Software:

          OS X 10.9 (13A603) - Uptime: 0 days 1:47:49

Disk Information:

          WDC WD1001FALS-40U9B0 disk0 : (1 TB)

                    EFI (disk0s1) <not mounted>: 209.7 MB

                    Macintosh HD (disk0s2) /: 999.35 GB (227.98 GB free)

                    Recovery HD (disk0s3) <not mounted>: 650 MB

          OPTIARC DVD RW AD-5670SC 

USB Information:

          Apple Inc. Built-in iSight

          JMicron USB to ATA/ATAPI Bridge 3 TB

                    EFI (disk1s1) <not mounted>: 209.7 MB

                    back up dock (disk1s2) /Volumes/back up dock: 3 TB (1.49 TB free)

          Apple Internal Memory Card Reader

          Western Digital My Book 1110 999.5 GB

                    EFI (disk3s1) <not mounted>: 209.7 MB

                    itunes (disk3s2) /Volumes/itunes: 999.16 GB (363.93 GB free)

          Apple Computer, Inc. IR Receiver

          Apple Inc. BRCM2046 Hub

                    Apple Inc. Bluetooth USB Host Controller

FireWire Information:

Thunderbolt Information:

Kernel Extensions:

          com.digidesign.iokit.DigiDal          (9.0.6f4 - SDK 10.5)

          tc.tctechnologies.driver.Saffire          (3.5.6 11675)

          com.paceap.kext.pacesupport.snowleopard          (5.8 - SDK 10.6)

          foo.tap          (1.0)

          foo.tun          (1.0)

Problem System Launch Daemons:

Problem System Launch Agents:

Launch Daemons:

          [loaded] com.adobe.fpsaud.plist

          [loaded] com.paceap.eden.licensed.plist

          [loaded] PACESupport.plist

          [loaded] tc.tctechnologies.Saffire.plist

Launch Agents:

          [loaded] com.epson.ews.launcher.plist

User Launch Agents:

          [loaded] com.adobe.ARM.[...].plist

          [failed] com.apple.CSConfigDotMacCert-[redacted]@me.com-SharedServices.Agent.plist

          [loaded] com.divx.agent.postinstall.plist

          [loaded] com.facebook.videochat.[redacted].plist

          [loaded] com.macpaw.CleanMyMac.helperTool.plist

          [loaded] com.macpaw.CleanMyMac.volumeWatcher.plist

User Login Items:

          iTunesHelper

          EEventManager

          Dropbox

          AdobeResourceSynchronizer

          EEventManager

          WDQuickView

          StatusMenu

3rd Party Preference Panes:

          DivX

          Flash Player

          Flip4Mac WMV

Internet Plug-ins::

          OVSHelper: Version: 1.1

          Default Browser: Version: 537 - SDK 10.9

          Flip4Mac WMV Plugin: Version: 2.4.0.11

          AdobePDFViewerNPAPI: Version: 10.1.8

          FlashPlayer-10.6: Version: 11.9.900.170 - SDK 10.6

          Silverlight: Version: 4.0.60531.0

          Flash Player: Version: 11.9.900.170 - SDK 10.6

          AmazonMP3DownloaderPlugin: Version: AmazonMP3DownloaderPlugin 1.0.15

          QuickTime Plugin: Version: 7.7.3

          iPhotoPhotocast: Version: 7.0 - SDK 10.8

          AdobePDFViewer: Version: 10.1.8

          JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Outdated! Update

User Internet Plug-ins::

          Move_Media_Player: Version: npmnqmp 071701000001

Bad Fonts:

          None

Old applications:

          Audacity:          Version: 1.3.13.0 - SDK 10.4

                    /Applications/Audacity/Audacity.app

          Digi CoreAudio Manager:          Version: 9.0.6 - SDK 10.5

                    /Applications/Digidesign/Digi CoreAudio Manager.app

          DigiTest:          Version: 9.0.6 - SDK 10.5

                    /Applications/Digidesign/Pro Tools/Pro Tools Utilities/DigiTest.app

          Epson Printer Utility 4:          Version: 9.14 - SDK 10.5

                    /Library/Printers/EPSON/InkjetPrinter2/Utility/UT4/Epson Printer Utility 4.app

          FacebookVideoCalling:          Version: 1.2.0.157 - SDK 10.5

                    /Users/fiddleplay/Library/Application Support/Facebook/video/1.2.0.158/FacebookVideoCalling.app

          Free Ringtone Maker:          Version: 1.6.5 - SDK 10.5

                    /Applications/Free Ringtone Maker.app

          InterLok Helper:          Version: 5.8 - SDK 10.4

                    /Library/Application Support/PACE Anti-Piracy/InterLok Helper.app

          Keynote:          Version: 5.3 - SDK 10.5

                    /Applications/iWork '09/Keynote.app

          Numbers:          Version: 2.3 - SDK 10.5

                    /Applications/iWork '09/Numbers.app

          Pages:          Version: 4.3 - SDK 10.5

                    /Applications/iWork '09/Pages.app

          Pro Tools:          Version: 9.0.6 - SDK 10.5

                    /Applications/Digidesign/Pro Tools/Pro Tools.app

          SoftwareUpdater:          Version: 9.0.6 - SDK 10.5

                    /Applications/Digidesign/Pro Tools/SoftwareUpdater.app

          TurboTax Deluxe 2011:          Version: 2011.r17.007 - SDK 10.4

                    /Users/fiddleplay/Applications/TurboTax Deluxe 2011.app

          Uninstall Pro Tools:          Version: 9.0.6 - SDK 10.4

                    /Applications/Digidesign/Pro Tools/Pro Tools Utilities/Uninstall Pro Tools.app

          WFTPairing:          Version:  - SDK 10.4

                    /Applications/Canon Utilities/EOS Utility/WFTPairing.app

          iSkysoft Helper Compact:          Version: 2.2.6.4 - SDK 10.5

                    /Users/fiddleplay/Library/Application Support/Helper/iSkysoft Helper Compact.app

          licenseDaemon:          Version: 1.1 - SDK 10.5

                    /Library/PrivilegedHelperTools/licenseDaemon.app

Time Machine:

          Skip System Files: NO

          Mobile backups: OFF

          Auto backup: YES

          Volumes being backed up:

                    Macintosh HD: Disk size: 930.71 GB Disk used: 718.39 GB

          Destinations:

                    back up dock [Local] (Last used)

                    Total size: 3 

                    Total number of backups: 36

                    Oldest backup: 2013-10-20 21:12:21 +0000

                    Last backup: 2013-12-15 04:56:42 +0000

                    Size of backup disk: Excellent

                              Backup size 3  > (Disk size 930.71 GB X 3)

          Time Machine details may not be accurate.

          All volumes being backed up may not be listed.

Top Processes by CPU:

              25%          WindowServer

               2%          EtreCheck

               2%          Dock

               0%          mds_stores

               0%          mds

Top Processes by Memory:

          164 MB          mds_stores

          164 MB          com.apple.IconServicesAgent

          164 MB          iTunes

          115 MB          Finder

          115 MB          Mail

Virtual Memory Statistics:

          12.30 GB          Free RAM

          2.22 GB          Active RAM

          308 MB          Inactive RAM

          1.18 GB          Wired RAM

          1.36 GB          Page-ins

          0 B          Page-outs

yes, from your above

     WDQuickView

  Western Digital My Book 1110 999.5 GB

                    EFI (disk3s1) <not mounted>: 209.7 MB

Go to WD.com and run their uninstaller program, you have had WD-ware on your Mac, and still have one piece (if not more) remaining on your Mac.

Thanks for t he advice, but I could not find an unistaller on the wd.com site.  If there is a link, I'd appreciate it.

Looks like they just removed it alas

http://community.wd.com/t5/News-Announcements/External-Drives-for-Mac-Experienci ng-Data-Loss-with-Maverick-OS/td-p/613777

I have same issue with a canon imageFormula p-208 usb portable scanner.  Same disk eject message appears randomly for no apparent reason.  I reported to the link posted by Plotiinus. Waiting for software issue to be resolved, as all equipment is otherwise new.

So clearly the issue exists, and just as clearly Apple seems to be doing nothing about it.  I wonder what will get them moving.  Threaten a class action?

Does anyone have the link to the main thread dealing with this ?

I think most of us are now past the whole - 'its a drive issue' - i've now used 6 different drives and 3 caddy's with 4 other drives with WD, Seagate and Hitachi drives - all disconect at odd times - particulalrly when time machine is on. Its a USB 3 driver issue with Mavericks and it needs sorting.

I think this is the main thread:(

I don't think 10.9.1 Update brings any good. There is nothing in the release note about USB2/3 issues.

Is it possible for the TS to change the subject? It's no longer a question.

Fiddleplay wrote:

Threaten a class action?

Read the terms you agreed to when you accepted the download and installation of Mavericks.

Pete

Found this thread because I'm having the same problem. My set up is a 'brand new' refurbished MBPr 2.3ghz w/ 8gb ram runing 10.9.  I have a USB 3 dual hardrive (2x2 TB seagate ) enclosure that just unmounts randomly. Everything is out of the box new so I'm trying to find a solution. Any help would be awesome. Thanks!

We as mentioned I am using WD bare hard drives in a USB3 caddy (ICY BOX) and I have had no problems since using a USB2 cable - so change your cables first and see what results you have

Sorry guys, but USB2 is all that I have been using and I have lost 3 drives. Lost as in they won't reformat.

Having the same issue here. Have a MacBook Pro 2013 and several different drives and USB 3 Memory sticks. All unmount unexpectedly under mavericks. They worked fine under the previous OS. The issue only happens when connected via USB 3 hubs. If I connect direct to the laptop, it's fine. 

I loaded the update, but it did not help theporblem.  I cannot understand why Apple is dragging their feet with this, and I am extremely concerned that I will lose all that is on my hardrives.

I tried the USB 2 cable solution but still no success.