Used dd command on Time Machine disk I was trying to write an img file to an SD Card and just assumed it was the same disk as a minute ago but it wasn't. I have dd'd a Raspbian image onto my Time Machine disk and need a way to restore it. I'm trying Disk Drill Free to restore the disk but I am not sure if it is going to work.

This is the command I used:

dd if=/../image.img of=/dev/rdisk1 bs=1m


The size of the image was 1.5gb. 

Solutions / tips please!
Wiping the first 1.5 GB of a disk does rather a lot of damage, and data recovery may require a lot of effort. So if it is "just" a backup and you have no urgent need to access any deleted files, it might be easiest to just reformat the disk using Disk Utility and reconnect the disk to Time Machine afterwards.