I have looked through the other questions here on AU, and none of them seem to help me deal with this particular problem, so I am starting a new question.
For some context, all I am trying to do is install the Ubuntu Rescue Remix image onto an external USB drive. I am currently running these commands on my iMac, according to the steps made available via the Ubuntu Rescue Remix instructions.
My problem is that even after I unmount [but not eject] the destination USB drive (assigned to /dev/disc4); I still get the
Operation not supported error, which (I think) is the error someone gets when trying to run a
dd operation on a mounted drive (or "Resource Busy" error).
So here is the command I run:
sudo dd if=ubuntu-rescue.img of=/dev/disc4 bs=1m
And here is the result I get:
dd: /dev/disc4: Operation not supported
The output I get from running
... /dev/disk4 #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *8.3 GB disk4 1: DOS_FAT_32 8GBUSBFLASH 8.3 GB disk4s1
So can anyone help me understand why I can't seem to run the dd command on /dev/disc4, even after it has been unmounted, yet not ejected?
Update: Someone cited this answer as a potential solution to my question, so perhaps someone might find an answer there, but my question is unique, because it is asking in the context of
dd operations, and the errors resulting from my
dd operations --- the suggested answer doesn't talk about
dd operations at all, so it can't serve as an answer to my problem.