I had a problem with a SD Card and I decided to use the ddrescue to solve it but everything went worse instead. I booted from a Live USB Ubuntu distribution and run the following command:

My mistake was that sda was the HDD where the windows partition was installed and ddrescue overwrote the hole disk. Is there a way to recover the content of the HDD in this case?

how large was the SD card?

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You don't have to backup all of your files, just the ones you want to keep.

SD card 8GB
HDD 320 GB

Hello Oliver,

We can assume that the first 8GB have been overwritten of your Windows partition. A full restore to the point where you can boot the drive and have a full folder structure will no longer be an option. However, a partial recovery should be possible. You can try something like get back data for NFTS and see what can be found. Also a raw recovery should be an option for you.

viel glück!

Agree, this command overwrites only the size of the source device on the destination.
So in this way, the MBR, boot sector, MFT are gone, but raw recovery and some scanning are an option here.
You can get the most of your important files if you don't do another similar mistakes.

Janos