When I Use an older iMac 27" as a second monitor do I still have access to the USB HDs en firewire Soundcard on this model? Or is it just an exstra monitor with no further mounting advantages?
iMac 27″, macOS 10.13
Target Display Mode went away when the first 27" 5K Retina iMac came out in Late 2014, and never returned.
Five 27" iMac models support Target Display Mode.
Apple placed a bunch of restrictions on Target Display Mode. For instance, no Mac that's being sold today will support using any iMac as a Target Display. So odds are that you can't use it at all.
Use your iMac as a display with target display mode - Apple Support
If by some miracle you can, you don't get access to anything but the screen.
"The other Mac can't use the iMac computer's built-in camera or ports. To use external devices with your other Mac, connect them directly to the other Mac, not to your iMac."
Target Display Mode went away when the first 27" 5K Retina iMac came out in Late 2014, and never returned.
Five 27" iMac models support Target Display Mode.
Apple placed a bunch of restrictions on Target Display Mode. For instance, no Mac that's being sold today will support using any iMac as a Target Display. So odds are that you can't use it at all.
Use your iMac as a display with target display mode - Apple Support
If by some miracle you can, you don't get access to anything but the screen.
"The other Mac can't use the iMac computer's built-in camera or ports. To use external devices with your other Mac, connect them directly to the other Mac, not to your iMac."
Can’t be done, sorry. The iMac is a computer not a monitor.
Use an older iMac 27" as a second monitor
