I tried to clone my laptop ubuntu partition using ddrescue into my portable harddisk
I run command "ddrescue r3 /dev/sda6 /dev/sdb6"


sdb6 is my portable harddisk partition with lots of data.
In my head I was thinking that it will create image file (like iso or img)that can be restored.
Suddenly I relize that it delete my existing data (in sdb6) then I interrupt ddrescue
Is there a way that I could get back my data in sdb6?
Partition in sdb6 is FAT32m, now when I try to open sdb6 using Windows OS, it always aks me to format

Please help...

*desperately*

I would clone your laptop drive to an IMG file on a third drive. Then I would clone your external hard drive to a second IMG file on the same drive.

Now compare the two IMG files. Identify the point at which the differences begin. Everything before that point has been overwritten. Use dd to write zeroes to the damaged portion of the IMG. This will ensure that your recovery software won't be confused by invalid data.

In fact, I'm wondering if creating a FAT32 partition entry (and boot sector?) will provide additional assistance to the data recovery software???

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RTFM before play with unknown programs....

In addition to above you can use testdisk to try and rebuild the file/folder information from the journalled data, but whatever has been overwritten is now perfectly sda6.

mount /dev/sdb6 /mnt/usbdrive
ddrescue --no-split /dev/sda6 /mnt/usbdrive/myimage.img /mnt/usbdrive/mylog.log