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Ordering the SD card may have been a mistake.
Not sure if you can make the SD cards into bootable installer "drives".

I might have tried this once years ago (can't remember), but I don't think it works on modern Macs or modern versions of the OS.

It might work on an old OS like High Sierra.
You'll have to try and see.

If it doesn't work, get a 16gb USB flash drive.
And "build" the installer using either DiskMaker X or Install Disk Creator.
You should read the OP's posts. The USB ports don't work. Also, how do you know SD cards do not work for this purpose? If you read the posts, you might learn something. 🙄
 
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Macintosh wrote:
"You should read the OP's posts. The USB ports don't work. Also, how do you know SD cards do not work for this purpose? If you read the posts, you might learn something"

Heh.

The OP said the USB ports on his LAPTOP weren't working.
Nothing about whether the ports on the iMac in question work, or not.

I "know" that SD cards might not work from having tried them in the past. There may have been a time "back then" when you could boot and run from an SD card, but not any more.

I'm thinking that the circuitry/controller on an SD card may not be sufficient to do this.
In my post above, I said the OP should TRY it, but that it might not work.

The OP needs to find a fully-functioning Mac on which to create the bootable USB flashdrive.

If he doesn't have easy access to one, he might consider going to a Mac repair shop and asking them to make one for him.

If that isn't an option, there are likely to be ebay sellers who will sell a pre-configured and bootable flashdrive with the OS installer he needs on it. Cost will run about $25.

OP:
I'm going to offer another course of action.
This may or may not work. (probably not)

From a powered off condition, boot to internet recovery with this special key combination:
Command-OPTION-Shift-R

This command will take you to a modified version of internet recovery that will attempt to install the earliest version of the OS that came on the iMac.
REASON WHY I'm suggesting -- it may offer you something "earlier than" High Sierra that works (such as El Capitan).
Again, this may not work, but give it a try and see what happens.
 
Ordering the SD card may have been a mistake.
Not sure if you can make the SD cards into bootable installer "drives".

I might have tried this once years ago (can't remember), but I don't think it works on modern Macs or modern versions of the OS.

It might work on an old OS like High Sierra.
You'll have to try and see.

If it doesn't work, get a 16gb USB flash drive.
And "build" the installer using either DiskMaker X or Install Disk Creator.

My SD card booted fine on my iMac 2010. Although I only made 1 EFI volume on it.
A few issue might come with the SD card reader writing prevention mechanism.
 
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I got the sd card because my laptop USB ports don’t work. I just remembered I do have a dell desktop that I don’t use. I suppose I could use that to create the usb. Was only thinking Apple.
 
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Macintosh wrote:
"You should read the OP's posts. The USB ports don't work. Also, how do you know SD cards do not work for this purpose? If you read the posts, you might learn something"

Heh.

The OP said the USB ports on his LAPTOP weren't working.
Nothing about whether the ports on the iMac in question work, or not.

I "know" that SD cards might not work from having tried them in the past. There may have been a time "back then" when you could boot and run from an SD card, but not any more.

I'm thinking that the circuitry/controller on an SD card may not be sufficient to do this.
In my post above, I said the OP should TRY it, but that it might not work.

The OP needs to find a fully-functioning Mac on which to create the bootable USB flashdrive.

If he doesn't have easy access to one, he might consider going to a Mac repair shop and asking them to make one for him.

If that isn't an option, there are likely to be ebay sellers who will sell a pre-configured and bootable flashdrive with the OS installer he needs on it. Cost will run about $25.

OP:
I'm going to offer another course of action.
This may or may not work. (probably not)

From a powered off condition, boot to internet recovery with this special key combination:
Command-OPTION-Shift-R

This command will take you to a modified version of internet recovery that will attempt to install the earliest version of the OS that came on the iMac.
REASON WHY I'm suggesting -- it may offer you something "earlier than" High Sierra that works (such as El Capitan).
Again, this may not work, but give it a try and see what happens.
Thx. Tried it, did nothing new. Did not take me to a different screen. Still high sierra.
 
OP:

I'm going to recommend a completely different course of action for you.
I don't normally suggest that a user install a version of the OS using "a hack", but in this case, it may actually help. (see my personal experience at the end of this reply)

Do this on the MacBook with the working SD card slot.

I recommend that you visit dosdude1's page here:

When you get there, go to "My Software" and choose the Mac OS Mojave Patcher:

Just click the download and it will download an app "Mojave Patcher" to your drive.
Hmmm... here's the link:

It looks like this will work on a 2011 iMac without problems.

See if you can run the Mojave Patcher app on the MacBook.
Does it launch and run?
OK, then go to the "Tools" menu and download a copy of the Mojave installer to your MacBook drive, also.

Once it's downloaded, I believe the Patcher will ask if you want to create a bootable installer drive.

You DO, so insert your SD card and "point the way".
SD card shoud be pre-formatted to "Mac OS extended, journaling enabled, GUID partition format" (using disk utility).

The patcher app will take some time, but it should create a bootable OS on the SD card along with the patching stuff.

Take this to the iMac and see if it will boot.
Does it?

At this point, you can attempt an install.
Have dosdude's instructions loaded on the MacBook as you work on the iMac.

If you try this, let us know how it goes.

Personal experience:
I made several tries with High Sierra to create an installer drive and get it to boot my 2010 MacBook Pro (which can run HS).
Although I could get the flashdrives "completed", I COULD NOT get them to boot successfully -- kept getting errors that the installer was damaged.
As an earlier poster mentioned in this thread, it's a problem with HS. There are fixes, but they look like they can get complicated.

But... The Mojave patched installer drive on the SD card booted up, and looked like it could install Mojave on the MBP without problems. I DID NOT attempt an actual install, because I want the 2010 MBP to keep running an older version of the OS.

However, this won't be important to you. You just need to get that iMac up and running.

Good luck.
 
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giving it a shot. went into disk utility, named SD card, chose Mac os extended journaled. guid partition was not an available option. i had already downloaded high sierra, to the point of install HS. my laptop already has HS.
 

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some readings say i need to move the drive (sd card) to the top of the view so i can partition it. also, mention if the card is 64gb or larger i need to choose exfat?
 
some readings say i need to move the drive (sd card) to the top of the view so i can partition it. also, mention if the card is 64gb or larger i need to choose exfat?
If it mounts, you do not need to do anything to the SD card. Change the name to, "MyVolume" is easiest. Make sure Sierra is in the applications directory and then run the terminal command. That will format and rename the SD card.

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
 
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If it mounts, you do not need to do anything to the SD card. Change the name to, "MyVolume" is easiest. Make sure Sierra is in the applications directory and then run the terminal command. That will format and rename the SD card.

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
thx. why should i change the name? run the terminal command? says
/Volumes/MyVolume is not a valid volume mount point.
 
thx. why should i change the name? run the terminal command? says
/Volumes/MyVolume is not a valid volume mount point.
This is why you should change the name to "MyVolume", otherwise you have to change the terminal command to match the name of the SD card. This is UNIX and must match - including case.
 
so, this pops up:
Ready to start.
To continue we need to erase the volume at /Volumes/MyVolume.
If you wish to continue type (Y) then press return: y
Erasing Disk: 0%... 10%... 20%... 30%...100%...
Copying installer files to disk...
The copy of the installer app failed.
 
OP:
Try what I recommended in reply 32 above (about using the Mojave patcher app).
THEN get back to us.

Note about disk utility app:
You MUST always check disk utility to see if it has a "view" menu.
If it does, you MUST always go to it and choose "show all devices".
Otherwise, you can't see the physical media (drive, SD card, etc.)

Note about formatting:
DO NOT use "expat"
DO NOT use "master boot record"
DO use "Mac OS extended, journaling enabled, GUID partition format".
 
You are not having much luck!

That seems like a generic error message. I've seen it when the card I used was too small, but that's not your problem. The High Sierra installer only takes up about 6GB. I've got installers loaded on 8GB and 32GB cards. I've got the installers loaded onto the slowest of the slow 8GB SD cards. The 32GB cards is more recent.

I would download the installer again and/or partition the SD card into smaller ones if that is possible.

20250626_074655.jpg
 
Macinto wrote:
"You are not having much luck!"

Now we know why that particular iMac ended up in the dump...

Prediction to the OP:
You're probably NOT going to get High Sierra running on that Mac.
Try something else (like the Mojave solution I suggested).
But realize at some point, you may end up taking it BACK TO the dump... :cool:
 
Macinto wrote:
"You are not having much luck!"

Now we know why that particular iMac ended up in the dump...

Prediction to the OP:
You're probably NOT going to get High Sierra running on that Mac.
Try something else (like the Mojave solution I suggested).
But realize at some point, you may end up taking it BACK TO the dump... :cool:
hi, not sure what this comment means. the problem right now is not being able to create a HS installer on my laptop installed SD card. i am not doing anything with the imac yet.
 
i do see there are some sellers on ebay selling usb high sierra drives. would that be the easiest was around this issue, and can we trust these sellers?
 
i want to thank everyone for your input so far. since i'm so busy, and the download hasn't happened as expected, i am considering purchasing an installer off of a highly rated seller on ebay. cost is about $15. the machine is not worth much, but i can't even evaluate it if i don't have the software installed.
 
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Check your old digital cameras or ask your neighbors if they have any SD card laying around. So many people have low capacity cards they don't use anymore.
 
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