External USB Drives Not Mounting on Wake From Sleep on new iMac Pro

The only USB devices that I have tried on the new iMac pro are external USB hard drives including USB3 and USB2 thumb (flash drives), the supplied Apple keyboard (connected via a lightening to USB2 cable also supplied with the iMac pro), and a Logitech Anywhere Mouse operating via a USB receiver plugged into the iMac Pro (needed because my supplied Magic Mouse 2 has suddenly ceased to work in Windows 10. The external USB drives of all types are repeated ejected upon wake from sleep. The keyboard and Logitech Anywhere Mouse are not impede in any way by waking the iMac pro from sleep.

Tom

Thank you for responding.

This problem is very clealry related to the lastest softare update from the app store. If I install the update, I cannot get past the login screen. I can enter my password, but the spnning activity circle continues forever and I can not get beyond that. If I boot from my clone made two days ago, all goes fine. I then use Super Duper to transfer the clone back to the Macintosh HD. I can then boot perfeclty fine from my Mcintosh HD. If I repeat all of this, I get hung after logging in with my password. This clearly points to something being installed in the software update. I submitted detailed feedback to Apple on this. Meanwhile, I will definitely not be installing this latest software update from Apple on my Early 2008 Mac Pro.

Tom

Kate,

I am sorry to hear that you are still having the same problem. I may not be fully out of the woods myself. After 7 times over a day and a half of putting my iMac Pro to sleep and then waking it 1-2 hours later without the external USB3 hard drives ejecting, when I woke up my iMac pro just a few moments ago, the bus-powered USB3 hard drive was ejected and I had to unplug and plug it back in. Interestingly, the externally powered USB3 hard drive was not ejected so hopefully this business will be rare.

Tom

I regret to say that my post above of January 26, 2018 stating that my problem of external USB hard drives being ejected from my iMac Pro upon wake from sleep had been solved is incorrect. The first five times I woke the iMac Pro from sleep the external hard drives were not ejected. However over the last two days each and every time I have taken the iMac pro out of sleep (10 times) all of my external hard drives have been ejected. The problem has not been solved, and I have written my Apple Senior Advisor that this case needs to be re-opened. I am now using the iMac Pro with no external USB hard drives attached for two reasons: (1) I am tired of having to restart the iMac pro to mount these drives after they are ejected upon wake from sleep; (20 the only way I can boot the iMac pro into Windows 10 is with no external USB hard drives attached. This has been my situation now since receiving my iMac Pro on December 26, 2017.

Tom

Is any other owner of the new iMac Pro (any configuration) having either of the problems that I have outlined in this thread, i.e. the ejecting of USB external hard drives on wake from sleep, not being able to boot into Windows 10 by holding the option key and selecting bootcamp, and the failure of the Apple Magic Mouse 2 to work after the latest Apple and Windows updates?

I am still having all three issues, and I have two open cases with Apple Support although it has been a few days since I have heard anything from my Senior Advisor on these cases.

Tom

I wanted to make a final post to this thread (started on December 30, 2017) three days after I received my new iMac Pro and discovered that all USB drives (of any type and brand) connected to the iMac Pro would immediately eject upon waking from sleep.

After working with several Apple Senior Advisors for more than six weeks, I am pleased to say that this issue has been solved. It was solved by removing a file (Pegasus2R2ICON.kext) from the systems library and placing it in the trash. This is one of two files installed by the driver download for the new Pegasus3 R6 raid 5 array that I purchased at the same time as my iMac Pro and installed on the thunderbolt 3 port. The driver, downloaded directly from the Promise site, is the correct one, but this file (which appears to serve no purpose since the Pegasus3 works fine with that file removed) is directly responsible for the immediate ejection of all external USB drives attached to the iMac Pro. I have never had a single ejection of the external USB drives since removing this file more than 14 days ago. Restoring this file and rebooting, then putting the iMac Pro to sleep and waking it in an hour or so produces an immediate ejection of the external USB hard drives.

Thus, the problem was related to the specific configuration of my iMac Pro (which has a Western Digital thunderbolt 2 My Book hard drive, a Pegasus3 thunderbolt 3 R6 raid array, and two WesternDigital USB 3 hard drives attached to its ports. Had I not had any USB drives attached to the iMac Pro I would never have seen the drive ejection issue even with the Pegasus3 attached. When I had external hard drives attached to the iMac Pro but no Pegasus3 on the iMac Pro, I never had a drive ejection problem. When I have the Pegasus 3 R6 array attached to the iMac Pro, but I remove the Pegasus2R2ICON.kext file and place it in the trash, I have no ejection of the external hard drives, and I see no deleterious results on the performance or operation of the Pegasus3 R6.

I have also observed and reported in the Bootcamp Apple forums that attachment of the Pegasus3 R6 to my iMac Pro results in my being unable to boot into Windows 10 (installed under Bootcamp). If I remove the Pegasus3 from the iMac Pro, I can boot every time into Windows 10 with no issues. I have notified and I am working with Promise Technology on these two issues produced by the Pegasus3 attached to an iMac Pro, but to date no resolution of the issue of being unable to boot into Windows 10 with the Pegasus3 attached has been forthcoming from Promise Support.

Tom

Correct.

Thank you very much for posting this abstract from a discussion on the Apple Development Forums.

I followed the directions carefully and completed the entire procedure. Unfortunately, these changes did not resolve either of the two issues (USB external drives ejecting on wake from sleep or being unable to boot into Windows 10 with any external USB drives attached to my iMac Pro)

I was not surprised since upon reading the entire discussion in the thread this procedure seems to be addressing an issue wherein USB drives are not being mounted on booting the Mac. That is not my problem at all. All of my USB external drives are always mounted when I boot up my iMac Pro or when I eject, unplug, and plug them in again. However they are ejected 95% of the time upon waking my iMac Pro from sleep. That and my inability to boot the iMac Pro into Windows 10 with external drives connected are my two issues. I believe these two issues are related, but I do not have direct evidence of that.

Thank you again.

Tom