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I made clean install on Samsung T5 SSD drive (500Gb, USB 3.1 Gen. 2), but boot now takes about 3 minutes. First, it's just black screen, about 1.5 minute. Second, small logo, about 1 minute. And at last normal logo, about half a minute.
I guess it isn't normal. What have I done wrong?
iMac 27", macOS 10.13
Thank you for answer!
iMac (Retina 5K, 27-inch, Late 2015), no USB-C. But anyway its's 3.0 and 5 Gbs. Only 1 Gbs difference with SATA.
And it doesn't look like speed issue, it looks like some kind of delay before boot from SSD.
No problem with SSD in OS:
Which iMac? Looking here for which UB port speeds are available with this iMac. Also for which USB cable is involved.
USB is quite commonly slower than SAS and SATA connections. This in the absence of USB-C and Thunderbolt with a Thunderbolt-capable cable, for instance.
Could also be a problem with the SSD (unlikely), and I’d confirm bus speeds against internal,storage speeds first.
The smaller logo looks like a resolution setting is off somewhere. Might be cleared with an NVRAM and SMC reset, or with a display setting in the booting macOS.
At the point in the boot up process when you see the Apple Logo, your Mac completed its POST test, and since you are booting from an external drive, it will look for the BootX booter file located in the /System/Library/CoreServices folder on that drive. BootX booter is responsible for loading the macOS kernel environment.
When the progress bar appears on the screen, your Mac is loading a number of kernel extensions. These are basically device drivers that are stored in /System/Library/Extensions. Depending on how many there are, this can take some time, especially from an external drive. The fact that you see an Apple Logo "change size" could be due to the effects of the video driver being loaded, and then started.
Did you enable TRIM on this drive?
Yes, i did.
After reseting SMC and NVRAM logo is normal size. Thank you!
When the progress bar appears loading takes 30 seconds. But black screen, after power on or reset, is still about 2 minutes :-C
There is boot.efi (576 Kb) in CoreServices folder. Is there a way to check if this file is ok? And may be somewhere are logs with information about this delay?
Absolutely nothing.
I realized it was AFPS with High Sierra issue. With Mojave boot time is 35 sec. I guess High Sierra with HFS+ would work correct.
I have tried to install macOS on PC using this SSD. Everything is ok. Boot time is about 40 seconds.
What's wrong with my imac? Help please :-C
Anything connected to the Mac that wasn't on the PC?
OK, thanks for the report. :)
Boot time from external SSD
