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I’m looking for a way to list all connected storage devices, like Disk Utility does. That means also for not mounted volumes.
The second thing I’m looking for is more detailed information, to what port a device is connected, the size of it and the block size of it.
Is there an API to do this? I prefer Cocoa, but a unix API is also ok.
diskutil can be used on the command line.
getmntinfo and getfsstat return information about mounted devices.
You can use the the various IOKit APIs to search for all block devices. You can check out the documentation, specifically you want to pay attention to IOServiceGetMatchingServices. There is example code to find all CD-Roms media in the system that could be easily adapted.