What is the first boot device in the boot order sequence

Question

What is the first boot device in the boot order sequence

I was wondering what is the first device that is activated when you reboot your computer. Also how many device can it support during the booting process?

iMac, OS X El Capitan (10.11.5)

Posted on Jul 22, 2016 10:34 AM

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Answer 1

macjack

Level 10

111,242 points

Jul 22, 2016 10:43 AM in response to Techgenius@345

A bit old but I think still valid:

BootROM

BootROM is a hardware component that contains the startup (boot) programs, which are the first processes that run when the computer is turned on. These programs include the Power-On Self Test (POST) and Open Firmware.

http://www.peachpit.com/guides/content.aspx?g=mac&seqNum=59

EDIT: About how many devices,

Apple Computers and Displays: Powering peripherals through USB - Apple Support

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Answer 2

Jul 22, 2016 10:57 AM in response to macjack

Thanks! Do you know how many devices can e in the boot sequence (extra devices)?

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Answer 3

macjack

Level 10

111,242 points

Jul 22, 2016 11:04 AM in response to Techgenius@345

I never tried myself, but in the Apple Support Topic that question is answered. It is dependent on how much power they use and how they are connected.

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Answer 4

JimmyCMPIT

Level 7

29,306 points

Jul 22, 2016 11:11 AM in response to Techgenius@345

at the very least 4, note my "snow leopard HD" is NOT blessed with an OS and is not an option, either is my bootable flash install of Mavericks. However both would be options if I OPTION boot instead of choosing the default OS from the control panel.

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Answer 5

Jul 22, 2016 11:14 AM in response to JimmyCMPIT

Thanks guys! One more thing, do you know where i could go to get the splash screen settings?

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