iM 4,1-14,4 Mid 2011 Opencore install disc not recognised.

[JW Pepper]

I have USB hard drive where I have used openCore to make a Ventura install boot image. But when I re-boot my computer and hold down the option key it just boots straight to High Sierra on the hard drive the install drive is simply not recognised.

Do I need to use a USB stick rather than a hard drive?

I have a Mid-2011 27" iMac, you can see here that the USB drive is not recognised as a boot disk.

 

[ifrit05]

Is the drive formatted as GUID? Is there a hidden EFI folder on a FAT32 partition?

 

[Nguyen Duc Hieu]

I would just install Opencore EFI on the internal drive from the begining. But maybe it's just me.

 

[MrScratchHook]

i believe you need a usb hub, due to usb slots being 1.1 on older macs and that was dropped on ventura, so any usb powered hub with 2.0 should work. Plug your keyboard and mouse to it. Now if the hardrive ventura installation still doesnt work then id suggest a usb installer and also put that into the usb hub, after ventura is installed you can get rid of the usb hub.

 

[ifrit05]

i believe you need a usb hub, due to usb slots being 1.1 on older macs and that was dropped on ventura, so any usb powered hub with 2.0 should work. Plug your keyboard and mouse to it. Now if the hardrive ventura installation still doesnt work then id suggest a usb installer and also put that into the usb hub, after ventura is installed you can get rid of the usb hub.

Macs have been using USB 2.0 since 2004.

 

[MrScratchHook]

Macs have been using USB 2.0 since 2004.

one would think this to be true, but my 2012 mac pro has 1.1 so everything before would as well. its clearly written in many places that peripherals like keyboard and mouse are 1.1 and once the macos kicks in the controller takes over. believe me i dont talk what i havent seen for myself.

 

[ifrit05]

one would think this to be true, but my 2012 mac pro has 1.1 so everything before would as well. its clearly written in many places that peripherals like keyboard and mouse are 1.1 and once the macos kicks in the controller takes over. believe me i dont talk what i havent seen for myself.

The Intel Tylersburg chipset (x58/5520) has support for USB 2.0. Your peripherals might be usb 1.1 only, pushing only those ports that these are connected to to those speeds. The controller/chipset is internally set at 2.0, macOS has nothing to do with that. I as well have a MacPro5,1 and it most differently has USB 2.0, I have done speed tests.

It is an undeniable fact that Apple has used USB 2.0 since 2004.

P.S. Connecting a 2.0 hub to a 1.1 port will make the hub 1.1. Connecting a 2.0 hub to 1.1 ports does not magically make it 2.0, it just acts as a port expander.

 

[MrScratchHook]

The Intel Tylersburg chipset (x58/5520) has support for USB 2.0. Your peripherals might be usb 1.1 only, pushing only those ports that these are connected to to those speeds. The controller/chipset is internally set at 2.0, macOS has nothing to do with that.

It is an undeniable fact that Apple has used USB 2.0 since 2004.

P.S. Connecting a 2.0 hub to a 1.1 port will make the hub 1.1. Connecting a 2.0 hub to 1.1 ports does not magically make it 2.0, it just acts as a port expander.

that may be true, but on the opencore legacy website, that is whats stated..even for macbook pro's you will need an external usb hub, so this is why i said that..

 

[ifrit05]

that may be true, but on the opencore legacy website, that is whats stated..even for macbook pro's you will need an external usb hub, so this is why i said that..

You are reading the info wrong.

[...]Apple also wired up every USB port to switch between USB 1.1 and USB 2.0 controllers depending on the peripheral. So if a user plugs a mouse into a MacPro5,1, this will engage the legacy USB 1.1 controller. However if you plug a USB 2.0 hub into said MacPro5,1, this will start up the USB 2.0 controller allowing for native support in macOS.

They are not saying the controller is 1.1, but on a hardware level there is a switch that swaps between 1.1 and 2.0 depending on what is plugged in.

 

[MrScratchHook]

You are reading the info wrong.



They are not saying the controller is 1.1, but on a hardware level there is a switch that swaps between 1.1 and 2.0 depending on what is plugged in.

ok i read it wrong or didnt fully understand it, you put it way more digestible and clear, so thank you for the clarity, but it still stands for what im saying about opencore needing a usb hub to install only..