Slow Boot Up on Mojave - External USB SSD

Loner T hope you are out there. I just upgraded my iMac to Mojave and now the system is booting extremely slow. I have my Mac OS on an external USB SSD drive and my data files on the internal 1 TB drive. The system was working perfect until recently. I did a backup and then wiped the drive completely and reinstalled Mojave and it is still having issues. Not sure where to start. The system does appear to function fine once booted up and logged in. I was planning on running Bootcamp the iMac but with all of the issues I decided to keep running Fusion.

Thanks!

iMac (27-inch, Late 2013), OS X El Capitan (10.11.3)

Posted on Oct 4, 2018 5:04 PM

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35 replies

Oct 6, 2018 1:48 PM in response to Loner T

The drive usually just shows blue when powered on which it is. It is a SSD drive connected to a USB 3 enclosure that connects to the iMac's USB port. Has been working fine for years until I upgraded to Mojave.

Oct 6, 2018 5:35 PM in response to Loner T

Last login: Sat Oct 6 19:46:00 on console

CATBUTT04:~ momanddad$ diskutil list

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_APFS Container disk1 999.9 GB disk0s2

/dev/disk1 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +999.9 GB disk1

Physical Store disk0s2

1: APFS Volume StorageDrive 928.3 GB disk1s1

/dev/disk2 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *63.9 GB disk2

1: Apple_HFS NIFTY64GBJ 63.8 GB disk2s1

/dev/disk3 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *120.0 GB disk3

1: EFI EFI 209.7 MB disk3s1

2: Apple_APFS Container disk4 119.8 GB disk3s2

/dev/disk4 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +119.8 GB disk4

Physical Store disk3s2

1: APFS Volume OSXDRIVE 78.4 GB disk4s1

2: APFS Volume Preboot 19.8 MB disk4s2

3: APFS Volume Recovery 512.4 MB disk4s3

4: APFS Volume VM 6.4 GB disk4s4

Oct 8, 2018 9:06 AM in response to Loner T

I have the same problem.

With OSX Sierra boot from USB take 30/40 seconds.

Same configuration, install OSX Mojave on same SSD and iMac start on 3 minutes.

SSD on connected un USB3 port like a OSX sierra, but OSX Mojave starts very very slow!

uufff... :-(

Oct 5, 2018 11:26 AM in response to Loner T

USB3 to the iMac. Haven't tried a SMC Reset. I can do that now..

Oct 5, 2018 11:27 AM in response to Loner T

Apologies. YES I did a SMC Reset.

Oct 5, 2018 12:28 PM in response to Loner T

Nope ;-(

Oct 5, 2018 2:22 PM in response to Loner T

How do I do that?

Loner T

Level 9

59,606 points

Oct 5, 2018 2:36 PM in response to Dick Richards

About This Mac -> System Report -> USB.

Oct 6, 2018 5:48 AM in response to Loner T

Loner T

Level 9

59,606 points

Oct 6, 2018 7:30 AM in response to Dick Richards

Is the external SSD self-powered or powered by the iMac?

Oct 6, 2018 12:49 PM in response to Loner T

Oct 6, 2018 3:01 PM in response to Loner T

So you are saying there is nothing I can do LT?

Oct 6, 2018 5:46 PM in response to Loner T

Unfortunately I do not. I think I have an extra thumb drive?

iz2lsc

Level 1

8 points

Oct 10, 2018 7:02 AM in response to Loner T

This is indeed a workaround. I expect that Apple will provide a fix asap.

Andrea

Loner T

Level 9

59,606 points

Oct 10, 2018 7:44 AM in response to iz2lsc

My expectations are low. 😉

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Slow Boot Up on Mojave - External USB SSD