Im new to this forum, so if i have posted the message in the wrong place please accept my apologies.
Issue: Not able to clone an SD Card successfully
Background: I have an SD card that is running some audio encoding software, its happy and works well, we can re-boot etc and there are no issues. I will call this SD "Source".
Trying to achieve: I need to make 5 copies of this SD card for backup and redundancy purposes (because of what we are doing the cards will be stored in physically different locations and need to be ready as quickly as possible) i.e. put SD card into a spare Raspberry Pi 3 power on and go.
To Note: Im using a Mac and we use macs generally, so need to be mac solutions.
Steps to reproduce:
sudo dd if=/dev/disk2 of=/Users/doozer/Desktop/encoder.img
Duration = 25 mins for 16GB
sudo dd if=/Users/doozer/Desktop/encoder.img of=/dev/disk2
Duration = 198 mins (3.3 hours) for 16GB
diskutil unmountDisk /dev/disk2
When I boot Destination SD Card in the same Rpi I get a kernel panic
" not syncing: VFS: Unable to mount root fs on unknown-block(179,7)
Can any Mac users give me any really good step by step ways to clone an SD card that are proven to work. I have confirmed Im using the same type and size SD Cards (Class 10, 16GB)
I appreciate your help and feedback.
Thanks in advance. B